diff --git a/AsbCloudInfrastructure/Services/WellOperationService/OperationsStatService.cs b/AsbCloudInfrastructure/Services/WellOperationService/OperationsStatService.cs
index edd8df56..004ce863 100644
--- a/AsbCloudInfrastructure/Services/WellOperationService/OperationsStatService.cs
+++ b/AsbCloudInfrastructure/Services/WellOperationService/OperationsStatService.cs
@@ -216,10 +216,8 @@ public class OperationsStatService : IOperationsStatService
         if (lastCorrespondingPlanOperation is null) 
             return null;
 
-        var lastFactOperation = factOperations.Last();
-
-        var factEnd = lastFactOperation.DateStart.AddHours(lastFactOperation.DurationHours);
-        var planEnd = lastCorrespondingFactOperation.DateStart.AddHours(lastCorrespondingFactOperation.DurationHours);
+        var factEnd = lastCorrespondingFactOperation.DateStart.AddHours(lastCorrespondingFactOperation.DurationHours);
+        var planEnd = lastCorrespondingPlanOperation.DateStart.AddHours(lastCorrespondingPlanOperation.DurationHours);
         var lagDays = (planEnd - factEnd).TotalDays;
 
         return lagDays;