tumbler timer
I put my tumbler on a plug-in outdoor light timer.
The ones you set for dusk-dawn/2hr/4hr etc.
Set the dial for 2 hours and then put a black piece of tape over the photocell.
This way I don't have to remember to turn off the tumbler or if I had a regular lamp timer, it would come on every day at that time.
It comes on once for 2 hours, then stays off.
Home depot has them for about $20
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