diff --git a/ReportImp/BeWoAuxilio/BeWoAuxilio.csproj b/ReportImp/BeWoAuxilio/BeWoAuxilio.csproj
index ec9a9db31..be7149256 100644
--- a/ReportImp/BeWoAuxilio/BeWoAuxilio.csproj
+++ b/ReportImp/BeWoAuxilio/BeWoAuxilio.csproj
@@ -69,6 +69,7 @@
     <Compile Include="Budgetnachweis.Designer.cs">
       <DependentUpon>Budgetnachweis.cs</DependentUpon>
     </Compile>
+    <Compile Include="Calculations\CustomGroupDurationCalculator.cs" />
     <Compile Include="CustomMitarbeiterstundenkontoBerechnung.cs" />
     <Compile Include="CustomMitarbeiterstundenkontoBerechnungMonate.cs" />
     <Compile Include="CustomReportCreator.cs" />
diff --git a/ReportImp/BeWoAuxilio/Calculations/CustomGroupDurationCalculator.cs b/ReportImp/BeWoAuxilio/Calculations/CustomGroupDurationCalculator.cs
new file mode 100644
index 000000000..33abb6cb3
--- /dev/null
+++ b/ReportImp/BeWoAuxilio/Calculations/CustomGroupDurationCalculator.cs
@@ -0,0 +1,18 @@
+using BeWo.Service.Plugins;
+using BS.Shared.DataContracts;
+
+namespace BeWoAuxilio.Calculation
+{
+    
+    public class CustomGroupDurationCalculator : GroupDurationCalculator
+    {
+        public override GroupDurationDC CalculateGroupDuration(int personCount, int employeeCount, decimal totalDuration)
+        {
+            return new GroupDurationDC()
+            {
+                SingleDuration = (totalDuration * employeeCount) / personCount,
+                TotalDuration = totalDuration
+            };
+        }
+    }
+}