Everything (show computer, dongles, controllers, FM transmitter) on 24/7 for the month unless doing maintenance. Show computer runs Zara Radio during non-show hours playing continuous commercial free (except time and temperature on the quarter hours) Christmas music which has become quite popular with our neighbors over the years.
I figure since a powered up controller in standby only draws a couple of watts of power there is no meaningful benefit to warrant the hardware to auto-power them up/down.
Greg