diff --git a/src/System.ServiceModel.NetFramingBase/src/System/ServiceModel/TimeSpanHelper.cs b/src/System.ServiceModel.NetFramingBase/src/System/ServiceModel/TimeSpanHelper.cs
deleted file mode 100644
index f8ea1ef377e..00000000000
--- a/src/System.ServiceModel.NetFramingBase/src/System/ServiceModel/TimeSpanHelper.cs
+++ /dev/null
@@ -1,30 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-
-using System.Diagnostics.Contracts;
-using System.Globalization;
-
-namespace System.ServiceModel
-{
-    internal static class TimeSpanHelper
-    {
-        static public TimeSpan FromMinutes(int minutes, string text)
-        {
-            TimeSpan value = TimeSpan.FromTicks(TimeSpan.TicksPerMinute * minutes);
-            Contract.Assert(value == TimeSpan.Parse(text, CultureInfo.InvariantCulture), "");
-            return value;
-        }
-        static public TimeSpan FromSeconds(int seconds, string text)
-        {
-            TimeSpan value = TimeSpan.FromTicks(TimeSpan.TicksPerSecond * seconds);
-            Contract.Assert(value == TimeSpan.Parse(text, CultureInfo.InvariantCulture), "");
-            return value;
-        }
-        static public TimeSpan FromMilliseconds(int ms, string text)
-        {
-            TimeSpan value = TimeSpan.FromTicks(TimeSpan.TicksPerMillisecond * ms);
-            Contract.Assert(value == TimeSpan.Parse(text, CultureInfo.InvariantCulture), "");
-            return value;
-        }
-    }
-}
diff --git a/src/System.ServiceModel.NetNamedPipe/src/System/ServiceModel/TimeSpanHelper.cs b/src/System.ServiceModel.NetNamedPipe/src/System/ServiceModel/TimeSpanHelper.cs
deleted file mode 100644
index f8ea1ef377e..00000000000
--- a/src/System.ServiceModel.NetNamedPipe/src/System/ServiceModel/TimeSpanHelper.cs
+++ /dev/null
@@ -1,30 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-
-using System.Diagnostics.Contracts;
-using System.Globalization;
-
-namespace System.ServiceModel
-{
-    internal static class TimeSpanHelper
-    {
-        static public TimeSpan FromMinutes(int minutes, string text)
-        {
-            TimeSpan value = TimeSpan.FromTicks(TimeSpan.TicksPerMinute * minutes);
-            Contract.Assert(value == TimeSpan.Parse(text, CultureInfo.InvariantCulture), "");
-            return value;
-        }
-        static public TimeSpan FromSeconds(int seconds, string text)
-        {
-            TimeSpan value = TimeSpan.FromTicks(TimeSpan.TicksPerSecond * seconds);
-            Contract.Assert(value == TimeSpan.Parse(text, CultureInfo.InvariantCulture), "");
-            return value;
-        }
-        static public TimeSpan FromMilliseconds(int ms, string text)
-        {
-            TimeSpan value = TimeSpan.FromTicks(TimeSpan.TicksPerMillisecond * ms);
-            Contract.Assert(value == TimeSpan.Parse(text, CultureInfo.InvariantCulture), "");
-            return value;
-        }
-    }
-}
diff --git a/src/System.ServiceModel.NetTcp/src/System/ServiceModel/TimeSpanHelper.cs b/src/System.ServiceModel.NetTcp/src/System/ServiceModel/TimeSpanHelper.cs
deleted file mode 100644
index f8ea1ef377e..00000000000
--- a/src/System.ServiceModel.NetTcp/src/System/ServiceModel/TimeSpanHelper.cs
+++ /dev/null
@@ -1,30 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-
-using System.Diagnostics.Contracts;
-using System.Globalization;
-
-namespace System.ServiceModel
-{
-    internal static class TimeSpanHelper
-    {
-        static public TimeSpan FromMinutes(int minutes, string text)
-        {
-            TimeSpan value = TimeSpan.FromTicks(TimeSpan.TicksPerMinute * minutes);
-            Contract.Assert(value == TimeSpan.Parse(text, CultureInfo.InvariantCulture), "");
-            return value;
-        }
-        static public TimeSpan FromSeconds(int seconds, string text)
-        {
-            TimeSpan value = TimeSpan.FromTicks(TimeSpan.TicksPerSecond * seconds);
-            Contract.Assert(value == TimeSpan.Parse(text, CultureInfo.InvariantCulture), "");
-            return value;
-        }
-        static public TimeSpan FromMilliseconds(int ms, string text)
-        {
-            TimeSpan value = TimeSpan.FromTicks(TimeSpan.TicksPerMillisecond * ms);
-            Contract.Assert(value == TimeSpan.Parse(text, CultureInfo.InvariantCulture), "");
-            return value;
-        }
-    }
-}
diff --git a/src/System.ServiceModel.UnixDomainSocket/src/System/ServiceModel/TimeSpanHelper.cs b/src/System.ServiceModel.UnixDomainSocket/src/System/ServiceModel/TimeSpanHelper.cs
deleted file mode 100644
index f8ea1ef377e..00000000000
--- a/src/System.ServiceModel.UnixDomainSocket/src/System/ServiceModel/TimeSpanHelper.cs
+++ /dev/null
@@ -1,30 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-
-using System.Diagnostics.Contracts;
-using System.Globalization;
-
-namespace System.ServiceModel
-{
-    internal static class TimeSpanHelper
-    {
-        static public TimeSpan FromMinutes(int minutes, string text)
-        {
-            TimeSpan value = TimeSpan.FromTicks(TimeSpan.TicksPerMinute * minutes);
-            Contract.Assert(value == TimeSpan.Parse(text, CultureInfo.InvariantCulture), "");
-            return value;
-        }
-        static public TimeSpan FromSeconds(int seconds, string text)
-        {
-            TimeSpan value = TimeSpan.FromTicks(TimeSpan.TicksPerSecond * seconds);
-            Contract.Assert(value == TimeSpan.Parse(text, CultureInfo.InvariantCulture), "");
-            return value;
-        }
-        static public TimeSpan FromMilliseconds(int ms, string text)
-        {
-            TimeSpan value = TimeSpan.FromTicks(TimeSpan.TicksPerMillisecond * ms);
-            Contract.Assert(value == TimeSpan.Parse(text, CultureInfo.InvariantCulture), "");
-            return value;
-        }
-    }
-}