diff --git a/ReportImp/HausDuelken/Calculations/CustomGroupDurationCalculator.cs b/ReportImp/HausDuelken/Calculations/CustomGroupDurationCalculator.cs
deleted file mode 100644
index 88626bae8..000000000
--- a/ReportImp/HausDuelken/Calculations/CustomGroupDurationCalculator.cs
+++ /dev/null
@@ -1,23 +0,0 @@
-
-using BeWo.Service.Plugins;
-using BS.Shared.DataContracts;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace HausDuelken.Calculations
-{
-    public class CustomGroupDurationCalculator : GroupDurationCalculator
-    {
-		public override GroupDurationDC CalculateGroupDuration(int personCount, int employeeCount, decimal totalDuration)
-		{
-			return new GroupDurationDC()
-			{
-				SingleDuration = totalDuration / personCount * employeeCount,
-				TotalDuration = totalDuration
-			};
-		}
-	}
-}
diff --git a/ReportImp/HausDuelken/HausDuelken.csproj b/ReportImp/HausDuelken/HausDuelken.csproj
index 394478778..8071b93fb 100644
--- a/ReportImp/HausDuelken/HausDuelken.csproj
+++ b/ReportImp/HausDuelken/HausDuelken.csproj
@@ -57,7 +57,6 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
-    <Compile Include="Calculations\CustomGroupDurationCalculator.cs" />
     <Compile Include="Calculations\CustomServiceRecordStatisticFactory.cs" />
     <Compile Include="CustomAnnualReportFactory.cs" />
     <Compile Include="CustomAuslastungBerechnung.cs" />