diff --git a/ProcessLib/HydroMechanics/Tests.cmake b/ProcessLib/HydroMechanics/Tests.cmake
index ef0b79eecc19609564923fcbaf0ba69af1a27064..306a6017a382b80bb89d47b1f926437f8c0f7329 100644
--- a/ProcessLib/HydroMechanics/Tests.cmake
+++ b/ProcessLib/HydroMechanics/Tests.cmake
@@ -707,7 +707,7 @@ AddTest(
 )
 if(NOT OGS_USE_MPI)
     NotebookTest(NOTEBOOKFILE HydroMechanics/StaggeredScheme/MandelCryer/mandelcryer.py
-                 RUNTIME 800)
+                 RUNTIME 25)
 endif()
 
 AddTest(