diff --git a/SGGL/FineUIPro.Web/DataShow/WorkingHours.aspx.cs b/SGGL/FineUIPro.Web/DataShow/WorkingHours.aspx.cs
index cee7a284..06c58e55 100644
--- a/SGGL/FineUIPro.Web/DataShow/WorkingHours.aspx.cs
+++ b/SGGL/FineUIPro.Web/DataShow/WorkingHours.aspx.cs
@@ -184,7 +184,7 @@ namespace FineUIPro.Web.DataShow
                     }
                     if (getAllPersonInOutList.Count() > 0)
                     {
-                        cout1 = getAllPersonInOutList.Sum(x => x.WorkHours ?? 0);
+                        cout1 = getAllPersonInOutList.Max(x => x.WorkHours ?? 0);
                     }
                 }
             }