diff --git a/.github/workflows/check-api-outdated.yml b/.github/workflows/check-api-outdated.yml
index 38818c3..227a05f 100644
--- a/.github/workflows/check-api-outdated.yml
+++ b/.github/workflows/check-api-outdated.yml
@@ -13,7 +13,6 @@ on:
     # “At 4 am on every day.” (https://crontab.guru)
     - cron: "0 4 * * *"
 
-
 jobs:
 
   check-api-outdated:
diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index a75d9a6..ccb4921 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -9,14 +9,13 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-
       - name: SCM Checkout
         uses: actions/checkout@v3
         with:
           fetch-depth: 0
 
       - name: Setup Python & Poetry Environment
-        uses: exasol/python-toolbox/.github/actions/python-environment@0.8.0
+        uses: exasol/python-toolbox/.github/actions/python-environment@0.9.0
 
       - name: Check Version(s)
         run: poetry run version-check version.py
@@ -80,36 +79,13 @@ jobs:
         run: poetry run nox -s type-check
 
   tests-job:
-    name: Tests (Python-${{ matrix.python-version }}, Exasol-${{ matrix.exasol-version}})
+    name: Tests (Python-${{ matrix.python-version }})
     needs: [build-documentation-job, lint-job, type-check-job]
-    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         python-version: ["3.10"]
-        exasol-version: ["7.1.9"]
-
-    steps:
-      - name: SCM Checkout
-        uses: actions/checkout@v3
-
-      - name: Setup Python & Poetry Environment
-        uses: exasol/python-toolbox/.github/actions/python-environment@0.9.0
-        with:
-          python-version: ${{ matrix.python-version }}
-
-      - name: Run Tests and Calculate Coverage
-        env:
-          SAAS_HOST: ${{ secrets.INTEGRATION_TEAM_SAAS_STAGING_HOST }}
-          SAAS_ACCOUNT_ID: ${{ secrets.INTEGRATION_TEAM_SAAS_STAGING_ACCOUNT_ID }}
-          SAAS_PAT: ${{ secrets.INTEGRATION_TEAM_SAAS_STAGING_PAT }}
-          PYTEST_ADDOPTS: -o log_cli=true -o log_cli_level=INFO
-        run: |
-          export PROJECT_SHORT_TAG=$(poetry run nox -s get-project-short-tag)
-          poetry run nox -s coverage -- --
-
-      - name: Upload Artifacts
-        uses: actions/upload-artifact@v3
-        with:
-          name: .coverage
-          path: .coverage
+    uses: ./.github/workflows/run-tests.yml
+    secrets: inherit
+    with:
+      python-version: ${{ matrix.python-version }}
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8e5dc15..ccf5d52 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,3 +23,28 @@ jobs:
   metrics:
     needs: [ ci-job ]
     uses: ./.github/workflows/report.yml
+
+  gate-1:
+    name: Regular
+    needs: [ ci-job ]
+    steps:
+      step:
+        - name: Branch Protection
+          run: true
+
+  slow-tests:
+    uses: ./.github/workflows/run-tests.yml
+    secrets: inherit
+    with:
+      slow-tests: true
+      python-version: "3.10"
+    environment:
+      slow-tests
+
+  gate-2:
+    name: Merge
+    needs: [ slow-tests ]
+    steps:
+      step:
+        - name: Branch Protection
+          run: true
diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
new file mode 100644
index 0000000..c23e1f2
--- /dev/null
+++ b/.github/workflows/run-tests.yml
@@ -0,0 +1,47 @@
+name: Run Tests
+
+on:
+  workflow_call:
+    inputs:
+      slow-tests:
+        type: boolean
+        default: false
+      python-version:
+        type: string
+        required: true
+
+jobs:
+
+  tests-job:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Set pytest markers
+        id: pytest-markers
+        if: ${{ ! inputs.slow-tests }}
+        run: echo slow-tests='-m "not slow"' >> "$GITHUB_OUTPUT"
+
+      - name: SCM Checkout
+        uses: actions/checkout@v3
+
+      - name: Setup Python & Poetry Environment
+        uses: exasol/python-toolbox/.github/actions/python-environment@0.9.0
+        with:
+          python-version: ${{ inputs.python-version }}
+
+      - name: Run Tests and Calculate Coverage
+        env:
+          SAAS_HOST: ${{ secrets.INTEGRATION_TEAM_SAAS_STAGING_HOST }}
+          SAAS_ACCOUNT_ID: ${{ secrets.INTEGRATION_TEAM_SAAS_STAGING_ACCOUNT_ID }}
+          SAAS_PAT: ${{ secrets.INTEGRATION_TEAM_SAAS_STAGING_PAT }}
+          PYTEST_ADDOPTS: '-o log_cli=true -o log_cli_level=INFO ${{ steps.pytest-markers.outputs.slow-tests }}'
+        run: |
+          echo "PYTEST_ADDOPTS = $PYTEST_ADDOPTS"
+          export PROJECT_SHORT_TAG=$(poetry run nox -s get-project-short-tag)
+          poetry run nox -s coverage -- --
+
+      - name: Upload Artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: .coverage
+          path: .coverage
diff --git a/doc/changes/unreleased.md b/doc/changes/unreleased.md
index f3039fd..7f5653f 100644
--- a/doc/changes/unreleased.md
+++ b/doc/changes/unreleased.md
@@ -1,4 +1,9 @@
 # Unreleased
 
+## Refactoring
+
+* #53: Separated long-running tests
+
 ## Features
-    - #55 Added publicly callable function finding the database id from its name.
+
+* #55 Added publicly callable function finding the database id from its name.
diff --git a/doc/developer_guide/developer_guide.md b/doc/developer_guide/developer_guide.md
index 25d9e08..bbe2849 100644
--- a/doc/developer_guide/developer_guide.md
+++ b/doc/developer_guide/developer_guide.md
@@ -58,6 +58,8 @@ After generating the API,
 
 ## Run Tests
 
+### Integration Tests
+
 Executing the integration tests requires the following environment variables to be set:
 
 | Variable          | Description                                           |
@@ -66,6 +68,12 @@ Executing the integration tests requires the following environment variables to
 | `SAAS_ACCOUNT_ID` | ID of the Exasol SAAS account to be used by the tests |
 | `SAAS_PAT`        | Personal access token to access the SAAS API          |
 
+### Slow Tests
+
+Some of the test cases verify connecting to a SaaS database instance and execution will take about 20 minutes.
+
+These test cases are disabled by default and will only be executed by adding a comment `[run-slow-tests]` to your pull request.
+
 ## Creating a Release
 
 ### Prepare the Release
diff --git a/exasol/saas/client/openapi/api/extensions/create_extension_instance.py b/exasol/saas/client/openapi/api/extensions/create_extension_instance.py
index 5ab6f95..35a3a0c 100644
--- a/exasol/saas/client/openapi/api/extensions/create_extension_instance.py
+++ b/exasol/saas/client/openapi/api/extensions/create_extension_instance.py
@@ -15,6 +15,7 @@
     AuthenticatedClient,
     Client,
 )
+from ...models.api_error import ApiError
 from ...models.create_extension_instance import CreateExtensionInstance
 from ...models.extension_instance import ExtensionInstance
 from ...types import (
@@ -54,20 +55,26 @@ def _get_kwargs(
     return _kwargs
 
 
-def _parse_response(*, client: Union[AuthenticatedClient, Client], response: httpx.Response) -> Optional[ExtensionInstance]:
+def _parse_response(*, client: Union[AuthenticatedClient, Client], response: httpx.Response) -> Optional[Union[ApiError, ExtensionInstance]]:
     if response.status_code == HTTPStatus.OK:
         response_200 = ExtensionInstance.from_dict(response.json())
 
 
 
         return response_200
+    if response.status_code == HTTPStatus.UNPROCESSABLE_ENTITY:
+        response_422 = ApiError.from_dict(response.json())
+
+
+
+        return response_422
     if client.raise_on_unexpected_status:
         raise errors.UnexpectedStatus(response.status_code, response.content)
     else:
         return None
 
 
-def _build_response(*, client: Union[AuthenticatedClient, Client], response: httpx.Response) -> Response[ExtensionInstance]:
+def _build_response(*, client: Union[AuthenticatedClient, Client], response: httpx.Response) -> Response[Union[ApiError, ExtensionInstance]]:
     return Response(
         status_code=HTTPStatus(response.status_code),
         content=response.content,
@@ -85,7 +92,7 @@ def sync_detailed(
     client: AuthenticatedClient,
     body: CreateExtensionInstance,
 
-) -> Response[ExtensionInstance]:
+) -> Response[Union[ApiError, ExtensionInstance]]:
     """ 
     Args:
         account_id (str):
@@ -99,7 +106,7 @@ def sync_detailed(
         httpx.TimeoutException: If the request takes longer than Client.timeout.
 
     Returns:
-        Response[ExtensionInstance]
+        Response[Union[ApiError, ExtensionInstance]]
      """
 
 
@@ -127,7 +134,7 @@ def sync(
     client: AuthenticatedClient,
     body: CreateExtensionInstance,
 
-) -> Optional[ExtensionInstance]:
+) -> Optional[Union[ApiError, ExtensionInstance]]:
     """ 
     Args:
         account_id (str):
@@ -141,7 +148,7 @@ def sync(
         httpx.TimeoutException: If the request takes longer than Client.timeout.
 
     Returns:
-        ExtensionInstance
+        Union[ApiError, ExtensionInstance]
      """
 
 
@@ -164,7 +171,7 @@ async def asyncio_detailed(
     client: AuthenticatedClient,
     body: CreateExtensionInstance,
 
-) -> Response[ExtensionInstance]:
+) -> Response[Union[ApiError, ExtensionInstance]]:
     """ 
     Args:
         account_id (str):
@@ -178,7 +185,7 @@ async def asyncio_detailed(
         httpx.TimeoutException: If the request takes longer than Client.timeout.
 
     Returns:
-        Response[ExtensionInstance]
+        Response[Union[ApiError, ExtensionInstance]]
      """
 
 
@@ -206,7 +213,7 @@ async def asyncio(
     client: AuthenticatedClient,
     body: CreateExtensionInstance,
 
-) -> Optional[ExtensionInstance]:
+) -> Optional[Union[ApiError, ExtensionInstance]]:
     """ 
     Args:
         account_id (str):
@@ -220,7 +227,7 @@ async def asyncio(
         httpx.TimeoutException: If the request takes longer than Client.timeout.
 
     Returns:
-        ExtensionInstance
+        Union[ApiError, ExtensionInstance]
      """
 
 
diff --git a/exasol/saas/client/openapi/api/extensions/get_extension.py b/exasol/saas/client/openapi/api/extensions/get_extension.py
index c9060e5..f4645b3 100644
--- a/exasol/saas/client/openapi/api/extensions/get_extension.py
+++ b/exasol/saas/client/openapi/api/extensions/get_extension.py
@@ -15,6 +15,7 @@
     AuthenticatedClient,
     Client,
 )
+from ...models.api_error import ApiError
 from ...models.extension_detail import ExtensionDetail
 from ...types import (
     UNSET,
@@ -44,20 +45,26 @@ def _get_kwargs(
     return _kwargs
 
 
-def _parse_response(*, client: Union[AuthenticatedClient, Client], response: httpx.Response) -> Optional[ExtensionDetail]:
+def _parse_response(*, client: Union[AuthenticatedClient, Client], response: httpx.Response) -> Optional[Union[ApiError, ExtensionDetail]]:
     if response.status_code == HTTPStatus.OK:
         response_200 = ExtensionDetail.from_dict(response.json())
 
 
 
         return response_200
+    if response.status_code == HTTPStatus.UNPROCESSABLE_ENTITY:
+        response_422 = ApiError.from_dict(response.json())
+
+
+
+        return response_422
     if client.raise_on_unexpected_status:
         raise errors.UnexpectedStatus(response.status_code, response.content)
     else:
         return None
 
 
-def _build_response(*, client: Union[AuthenticatedClient, Client], response: httpx.Response) -> Response[ExtensionDetail]:
+def _build_response(*, client: Union[AuthenticatedClient, Client], response: httpx.Response) -> Response[Union[ApiError, ExtensionDetail]]:
     return Response(
         status_code=HTTPStatus(response.status_code),
         content=response.content,
@@ -74,7 +81,7 @@ def sync_detailed(
     *,
     client: AuthenticatedClient,
 
-) -> Response[ExtensionDetail]:
+) -> Response[Union[ApiError, ExtensionDetail]]:
     """ 
     Args:
         account_id (str):
@@ -87,7 +94,7 @@ def sync_detailed(
         httpx.TimeoutException: If the request takes longer than Client.timeout.
 
     Returns:
-        Response[ExtensionDetail]
+        Response[Union[ApiError, ExtensionDetail]]
      """
 
 
@@ -113,7 +120,7 @@ def sync(
     *,
     client: AuthenticatedClient,
 
-) -> Optional[ExtensionDetail]:
+) -> Optional[Union[ApiError, ExtensionDetail]]:
     """ 
     Args:
         account_id (str):
@@ -126,7 +133,7 @@ def sync(
         httpx.TimeoutException: If the request takes longer than Client.timeout.
 
     Returns:
-        ExtensionDetail
+        Union[ApiError, ExtensionDetail]
      """
 
 
@@ -147,7 +154,7 @@ async def asyncio_detailed(
     *,
     client: AuthenticatedClient,
 
-) -> Response[ExtensionDetail]:
+) -> Response[Union[ApiError, ExtensionDetail]]:
     """ 
     Args:
         account_id (str):
@@ -160,7 +167,7 @@ async def asyncio_detailed(
         httpx.TimeoutException: If the request takes longer than Client.timeout.
 
     Returns:
-        Response[ExtensionDetail]
+        Response[Union[ApiError, ExtensionDetail]]
      """
 
 
@@ -186,7 +193,7 @@ async def asyncio(
     *,
     client: AuthenticatedClient,
 
-) -> Optional[ExtensionDetail]:
+) -> Optional[Union[ApiError, ExtensionDetail]]:
     """ 
     Args:
         account_id (str):
@@ -199,7 +206,7 @@ async def asyncio(
         httpx.TimeoutException: If the request takes longer than Client.timeout.
 
     Returns:
-        ExtensionDetail
+        Union[ApiError, ExtensionDetail]
      """
 
 
diff --git a/exasol/saas/client/openapi/api/extensions/list_extension_instances.py b/exasol/saas/client/openapi/api/extensions/list_extension_instances.py
index fd1230c..94df9dd 100644
--- a/exasol/saas/client/openapi/api/extensions/list_extension_instances.py
+++ b/exasol/saas/client/openapi/api/extensions/list_extension_instances.py
@@ -15,6 +15,7 @@
     AuthenticatedClient,
     Client,
 )
+from ...models.api_error import ApiError
 from ...models.extension_instance import ExtensionInstance
 from ...types import (
     UNSET,
@@ -44,7 +45,7 @@ def _get_kwargs(
     return _kwargs
 
 
-def _parse_response(*, client: Union[AuthenticatedClient, Client], response: httpx.Response) -> Optional[List['ExtensionInstance']]:
+def _parse_response(*, client: Union[AuthenticatedClient, Client], response: httpx.Response) -> Optional[Union[ApiError, List['ExtensionInstance']]]:
     if response.status_code == HTTPStatus.OK:
         response_200 = []
         _response_200 = response.json()
@@ -56,13 +57,19 @@ def _parse_response(*, client: Union[AuthenticatedClient, Client], response: htt
             response_200.append(response_200_item)
 
         return response_200
+    if response.status_code == HTTPStatus.UNPROCESSABLE_ENTITY:
+        response_422 = ApiError.from_dict(response.json())
+
+
+
+        return response_422
     if client.raise_on_unexpected_status:
         raise errors.UnexpectedStatus(response.status_code, response.content)
     else:
         return None
 
 
-def _build_response(*, client: Union[AuthenticatedClient, Client], response: httpx.Response) -> Response[List['ExtensionInstance']]:
+def _build_response(*, client: Union[AuthenticatedClient, Client], response: httpx.Response) -> Response[Union[ApiError, List['ExtensionInstance']]]:
     return Response(
         status_code=HTTPStatus(response.status_code),
         content=response.content,
@@ -79,7 +86,7 @@ def sync_detailed(
     *,
     client: AuthenticatedClient,
 
-) -> Response[List['ExtensionInstance']]:
+) -> Response[Union[ApiError, List['ExtensionInstance']]]:
     """ 
     Args:
         account_id (str):
@@ -92,7 +99,7 @@ def sync_detailed(
         httpx.TimeoutException: If the request takes longer than Client.timeout.
 
     Returns:
-        Response[List['ExtensionInstance']]
+        Response[Union[ApiError, List['ExtensionInstance']]]
      """
 
 
@@ -118,7 +125,7 @@ def sync(
     *,
     client: AuthenticatedClient,
 
-) -> Optional[List['ExtensionInstance']]:
+) -> Optional[Union[ApiError, List['ExtensionInstance']]]:
     """ 
     Args:
         account_id (str):
@@ -131,7 +138,7 @@ def sync(
         httpx.TimeoutException: If the request takes longer than Client.timeout.
 
     Returns:
-        List['ExtensionInstance']
+        Union[ApiError, List['ExtensionInstance']]
      """
 
 
@@ -152,7 +159,7 @@ async def asyncio_detailed(
     *,
     client: AuthenticatedClient,
 
-) -> Response[List['ExtensionInstance']]:
+) -> Response[Union[ApiError, List['ExtensionInstance']]]:
     """ 
     Args:
         account_id (str):
@@ -165,7 +172,7 @@ async def asyncio_detailed(
         httpx.TimeoutException: If the request takes longer than Client.timeout.
 
     Returns:
-        Response[List['ExtensionInstance']]
+        Response[Union[ApiError, List['ExtensionInstance']]]
      """
 
 
@@ -191,7 +198,7 @@ async def asyncio(
     *,
     client: AuthenticatedClient,
 
-) -> Optional[List['ExtensionInstance']]:
+) -> Optional[Union[ApiError, List['ExtensionInstance']]]:
     """ 
     Args:
         account_id (str):
@@ -204,7 +211,7 @@ async def asyncio(
         httpx.TimeoutException: If the request takes longer than Client.timeout.
 
     Returns:
-        List['ExtensionInstance']
+        Union[ApiError, List['ExtensionInstance']]
      """
 
 
diff --git a/pyproject.toml b/pyproject.toml
index 2508b8f..30ae86e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -52,6 +52,10 @@ testpaths = [
     "test"
 ]
 
+markers = [
+    "slow: marks tests as slow (deselect with '-m \"not slow\"')",
+]
+
 [tool.coverage.run]
 relative_files = true
 source = [
diff --git a/test/integration/connection_test.py b/test/integration/connection_test.py
index 59b57ae..525b96d 100644
--- a/test/integration/connection_test.py
+++ b/test/integration/connection_test.py
@@ -1,7 +1,9 @@
+import pytest
 import pyexasol
 from exasol.saas.client.api_access import get_connection_params
 
 
+@pytest.mark.slow
 def test_get_connection_params_with_id(saas_host, saas_pat, saas_account_id,
                                        operational_saas_database_id,
                                        allow_connection):
@@ -18,6 +20,7 @@ def test_get_connection_params_with_id(saas_host, saas_pat, saas_account_id,
         assert result == [(1,)]
 
 
+@pytest.mark.slow
 def test_get_connection_params_with_name(saas_host, saas_pat, saas_account_id,
                                          operational_saas_database_id, database_name,
                                          allow_connection):