I have done something similar to this, but it was for safety reasons. A family had an elderly parent living in a basement apartment who was continously leaving the oven on after using it. We installed a wall-type one hour timer that controlled a contactor at the panel. She would just turn the timer on and she then had one hour to do her cooking. If she needed more time, she could just turn the timer up, so this insured that she would have to stay nearby when cooking.
