diff --git a/PolyShim.Tests/Net70/ProcessTests.cs b/PolyShim.Tests/Net70/ProcessTests.cs
new file mode 100644
index 0000000..d3674c0
--- /dev/null
+++ b/PolyShim.Tests/Net70/ProcessTests.cs
@@ -0,0 +1,64 @@
+using System;
+using System.Diagnostics;
+using FluentAssertions;
+using Xunit;
+
+namespace PolyShim.Tests.Net70;
+
+public class ProcessTests
+{
+    [Fact]
+    public void WaitForExit_TimeSpan_Test()
+    {
+        // Arrange
+        using var process = new Process
+        {
+            StartInfo = new ProcessStartInfo
+            {
+                FileName = OperatingSystem.IsWindows() ? "cmd" : "sleep",
+                Arguments = OperatingSystem.IsWindows() ? "/c timeout 1" : "1",
+                CreateNoWindow = true,
+                UseShellExecute = false,
+            },
+        };
+
+        process.Start();
+
+        // Act
+        var exited = process.WaitForExit(TimeSpan.FromSeconds(10));
+
+        // Assert
+        exited.Should().BeTrue();
+        process.HasExited.Should().BeTrue();
+    }
+
+    [Fact]
+    public void WaitForExit_TimeSpan_Timeout_Test()
+    {
+        // Arrange
+        using var process = new Process
+        {
+            StartInfo = new ProcessStartInfo
+            {
+                FileName = OperatingSystem.IsWindows() ? "cmd" : "sleep",
+                Arguments = OperatingSystem.IsWindows() ? "/c timeout 30 /nobreak" : "30",
+                CreateNoWindow = true,
+                UseShellExecute = false,
+            },
+        };
+        process.Start();
+
+        try
+        {
+            // Act
+            var exited = process.WaitForExit(TimeSpan.FromMilliseconds(100));
+
+            // Assert
+            exited.Should().BeFalse();
+        }
+        finally
+        {
+            process.Kill();
+        }
+    }
+}
diff --git a/PolyShim/Net70/Process.cs b/PolyShim/Net70/Process.cs
new file mode 100644
index 0000000..c6b6762
--- /dev/null
+++ b/PolyShim/Net70/Process.cs
@@ -0,0 +1,29 @@
+#if FEATURE_PROCESS
+#if (NETCOREAPP && !NET7_0_OR_GREATER) || (NETFRAMEWORK) || (NETSTANDARD)
+#nullable enable
+#pragma warning disable CS0436
+
+using System;
+using System.Diagnostics;
+using System.Diagnostics.CodeAnalysis;
+
+#if !POLYSHIM_INCLUDE_COVERAGE
+[ExcludeFromCodeCoverage]
+#endif
+internal static class MemberPolyfills_Net70_Process
+{
+    extension(Process process)
+    {
+        // https://learn.microsoft.com/dotnet/api/system.diagnostics.process.waitforexit#system-diagnostics-process-waitforexit(system-timespan)
+        public bool WaitForExit(TimeSpan timeout)
+        {
+            var totalMilliseconds = (long)timeout.TotalMilliseconds;
+            if (totalMilliseconds < -1 || totalMilliseconds > int.MaxValue)
+                throw new ArgumentOutOfRangeException(nameof(timeout));
+
+            return process.WaitForExit((int)totalMilliseconds);
+        }
+    }
+}
+#endif
+#endif
diff --git a/Signatures.md b/Signatures.md
index fd4079b..b4836ca 100644
--- a/Signatures.md
+++ b/Signatures.md
@@ -1,8 +1,8 @@
 # Signatures
 
-- **Total:** 487
+- **Total:** 488
 - **Types:** 106
-- **Members:** 381
+- **Members:** 382
 
 ___
 
@@ -369,6 +369,7 @@ ___
   - [`static string Join(params string?[])`](https://learn.microsoft.com/dotnet/api/system.io.path.join#system-io-path-join(system-string())) <sup><sub>.NET Core 3.0</sub></sup>
   - [`static string TrimEndingDirectorySeparator(string)`](https://learn.microsoft.com/dotnet/api/system.io.path.trimendingdirectoryseparator#system-io-path-trimendingdirectoryseparator(system-string)) <sup><sub>.NET Core 3.0</sub></sup>
 - `Process`
+  - [`bool WaitForExit(TimeSpan)`](https://learn.microsoft.com/dotnet/api/system.diagnostics.process.waitforexit#system-diagnostics-process-waitforexit(system-timespan)) <sup><sub>.NET 7.0</sub></sup>
   - [`Task WaitForExitAsync(CancellationToken)`](https://learn.microsoft.com/dotnet/api/system.diagnostics.process.waitforexitasync) <sup><sub>.NET 5.0</sub></sup>
   - [`void Kill(bool)`](https://learn.microsoft.com/dotnet/api/system.diagnostics.process.kill#system-diagnostics-process-kill(system-boolean)) <sup><sub>.NET Core 3.0</sub></sup>
 - `Queue<T>`