diff --git a/aws/sdk/integration-tests/s3/Cargo.toml b/aws/sdk/integration-tests/s3/Cargo.toml
index 5093b00f740..33cadc62cf1 100644
--- a/aws/sdk/integration-tests/s3/Cargo.toml
+++ b/aws/sdk/integration-tests/s3/Cargo.toml
@@ -48,3 +48,6 @@ tracing-subscriber = { version = "0.3.15", features = ["env-filter", "json"] }
 # If you're writing a test with this, take heed! `no-env-filter` means you'll be capturing
 # logs from everything that speaks, so be specific with your asserts.
 tracing-test = { version = "0.2.4", features = ["no-env-filter"] }
+
+[dependencies]
+once_cell = "1.18.0"
diff --git a/aws/sdk/integration-tests/s3/tests/throughput-timeout.rs b/aws/sdk/integration-tests/s3/tests/throughput-timeout.rs
index 0a459eda717..d07410d1fa4 100644
--- a/aws/sdk/integration-tests/s3/tests/throughput-timeout.rs
+++ b/aws/sdk/integration-tests/s3/tests/throughput-timeout.rs
@@ -6,31 +6,35 @@
 use aws_sdk_sts::error::DisplayErrorContext;
 use aws_smithy_async::rt::sleep::AsyncSleep;
 use aws_smithy_async::test_util::instant_time_and_sleep;
+use aws_smithy_async::time::SharedTimeSource;
 use aws_smithy_http::body::SdkBody;
 use aws_smithy_http::byte_stream::ByteStream;
 use aws_smithy_runtime::client::http::body::minimum_throughput::MinimumThroughputBody;
 use aws_smithy_runtime::test_util::capture_test_logs::capture_test_logs;
+use aws_smithy_runtime_api::shared::IntoShared;
+use aws_types::sdk_config::SharedAsyncSleep;
+use bytes::Bytes;
+use once_cell::sync::Lazy;
 use std::convert::Infallible;
 use std::time::{Duration, UNIX_EPOCH};
 
 #[should_panic = "minimum throughput was specified at 2 B/s, but throughput of 1.5 B/s was observed"]
 #[tokio::test]
-async fn test_throughput_timeout_happens_for_slow_stream() {
+async fn test_throughput_timeout_less_than() {
     let _logs = capture_test_logs();
     let (time_source, sleep) = instant_time_and_sleep(UNIX_EPOCH);
 
     let shared_sleep = sleep.clone();
-    // Will send ~1 byte per second because ASCII digits have a size
-    // of 1 byte and we sleep for 1 second after every digit we send.
+    // Will send ~1 byte per second.
     let stream = futures_util::stream::unfold(1, move |state| {
         let sleep = shared_sleep.clone();
         async move {
-            if state > 100 {
+            if state > 255 {
                 None
             } else {
                 sleep.sleep(Duration::from_secs(1)).await;
                 Some((
-                    Result::<String, Infallible>::Ok(state.to_string()),
+                    Result::<_, Infallible>::Ok(Bytes::from(vec![state as u8])),
                     state + 1,
                 ))
             }
@@ -39,7 +43,7 @@ async fn test_throughput_timeout_happens_for_slow_stream() {
     let body = ByteStream::new(SdkBody::from(hyper::body::Body::wrap_stream(stream)));
     let body = body.map(move |body| {
         let ts = time_source.clone();
-        // Throw an error if the stream sends less than 2 bytes per second at any point
+        // Throw an error if the stream sends less than 2 bytes per second
         let minimum_throughput = (2u64, Duration::from_secs(1));
         SdkBody::from_dyn(aws_smithy_http::body::BoxBody::new(
             MinimumThroughputBody::new(ts, body, minimum_throughput),
@@ -53,23 +57,25 @@ async fn test_throughput_timeout_happens_for_slow_stream() {
     }
 }
 
+const EXPECTED_BYTES: Lazy<Vec<u8>> = Lazy::new(|| (1..=255).map(|i| i as u8).collect::<Vec<_>>());
+
 #[tokio::test]
-async fn test_throughput_timeout_doesnt_happen_for_fast_stream() {
+async fn test_throughput_timeout_equal_to() {
     let _logs = capture_test_logs();
     let (time_source, sleep) = instant_time_and_sleep(UNIX_EPOCH);
+    let time_source: SharedTimeSource = time_source.into_shared();
+    let sleep: SharedAsyncSleep = sleep.into_shared();
 
-    let shared_sleep = sleep.clone();
-    // Will send ~1 byte per second because ASCII digits have a size
-    // of 1 byte and we sleep for 1 second after every digit we send.
+    // Will send ~1 byte per second.
     let stream = futures_util::stream::unfold(1, move |state| {
-        let sleep = shared_sleep.clone();
+        let sleep = sleep.clone();
         async move {
-            if state > 100 {
+            if state > 255 {
                 None
             } else {
                 sleep.sleep(Duration::from_secs(1)).await;
                 Some((
-                    Result::<String, Infallible>::Ok(state.to_string()),
+                    Result::<_, Infallible>::Ok(Bytes::from(vec![state as u8])),
                     state + 1,
                 ))
             }
@@ -77,16 +83,60 @@ async fn test_throughput_timeout_doesnt_happen_for_fast_stream() {
     });
     let body = ByteStream::new(SdkBody::from(hyper::body::Body::wrap_stream(stream)));
     let body = body.map(move |body| {
-        let ts = time_source.clone();
-        // Throw an error if the stream sends less than 1 bytes per 2s at any point
+        let time_source = time_source.clone();
+        // Throw an error if the stream sends less than 1 byte per second
+        let minimum_throughput = (1u64, Duration::from_secs(1));
+        SdkBody::from_dyn(aws_smithy_http::body::BoxBody::new(
+            MinimumThroughputBody::new(time_source, body, minimum_throughput),
+        ))
+    });
+    // assert_eq!(255.0, time_source.seconds_since_unix_epoch());
+    // assert_eq!(Duration::from_secs(255), sleep.total_duration());
+    let res = body
+        .collect()
+        .await
+        .expect("no streaming error occurs because data is sent fast enough")
+        .to_vec();
+    assert_eq!(*EXPECTED_BYTES, res);
+}
+
+#[tokio::test]
+async fn test_throughput_timeout_greater_than() {
+    let _logs = capture_test_logs();
+    let (time_source, sleep) = instant_time_and_sleep(UNIX_EPOCH);
+    let time_source: SharedTimeSource = time_source.into_shared();
+    let sleep: SharedAsyncSleep = sleep.into_shared();
+
+    // Will send ~1 byte per second.
+    let stream = futures_util::stream::unfold(1, move |state| {
+        let sleep = sleep.clone();
+        async move {
+            if state > 255 {
+                None
+            } else {
+                sleep.sleep(Duration::from_secs(1)).await;
+                Some((
+                    Result::<_, Infallible>::Ok(Bytes::from(vec![state as u8])),
+                    state + 1,
+                ))
+            }
+        }
+    });
+    let body = ByteStream::new(SdkBody::from(hyper::body::Body::wrap_stream(stream)));
+    let body = body.map(move |body| {
+        let time_source = time_source.clone();
+        // Throw an error if the stream sends less than 1 byte per 2s
         let minimum_throughput = (1u64, Duration::from_secs(2));
         SdkBody::from_dyn(aws_smithy_http::body::BoxBody::new(
-            MinimumThroughputBody::new(ts, body, minimum_throughput),
+            MinimumThroughputBody::new(time_source, body, minimum_throughput),
         ))
     });
-    assert_eq!(Duration::from_secs(100), sleep.total_duration());
-    let _res = body
+    // assert_eq!(255.0, time_source.seconds_since_unix_epoch());
+    // assert_eq!(Duration::from_secs(255), sleep.total_duration());
+    let res = body
         .collect()
         .await
-        .expect("no streaming error occurs because data is sent fast enough");
+        .expect("no streaming error occurs because data is sent fast enough")
+        .to_vec();
+    assert_eq!(*EXPECTED_BYTES, res);
 }
diff --git a/rust-runtime/aws-smithy-async/src/test_util.rs b/rust-runtime/aws-smithy-async/src/test_util.rs
index dd7eacfd895..2627d64f215 100644
--- a/rust-runtime/aws-smithy-async/src/test_util.rs
+++ b/rust-runtime/aws-smithy-async/src/test_util.rs
@@ -74,6 +74,12 @@ impl TimeSource for ManualTimeSource {
     }
 }
 
+impl TimeSource for Arc<ManualTimeSource> {
+    fn now(&self) -> SystemTime {
+        self._now(&self.log.lock().unwrap())
+    }
+}
+
 /// A sleep implementation where calls to [`AsyncSleep::sleep`] block until [`SleepGate::expect_sleep`] is called
 ///
 /// Create a [`ControlledSleep`] with [`controlled_time_and_sleep`]