Delay in Scene not working

I have a scene that say when devise#75 turns on, wait 30 minuted a turn #75 off. It works great, but the time is about 5 to 8 minutes not 30. I have deleted the scene and recreated it several times with the same result. Anyone else had this problem.

Aubrey

If you remove the trigger from the scene, turn on the device and then manually run the scene, is the scene timing correct?

Is this scene is comprised of a motion sensor and a light? Many Z-Wave motion sensors have a default untrip time of around 5 minutes.

I would check to make sure that the motion sensor does not have a direct association with the light. If it does, the motion sensor will turn the light Off, directly without the scene.