Basicaly you have to set the timer ahead of time. There are no if, ands or buts about it.

What I do, I set a time that I want my units to turn on, in your case off. The same time every Monday, Tuesday and so on. But other days like the weekends, it would be a different time.

But of course that is my "alarm" to wake me up for work. But since you are turning the units off. then I wouldn't know what to do.

Rob