+1, only off for cleaning.
Well, one exception, since my ATO pumps into the a tee inserted between the skimmer venturi and my co2 scrubber, Apex will shut in down if the ATO is on more then 15 minutes. I do this to prevent the water level from rising too high and potentially causing a small overflow. The ATO has never run that long though.
I run the ATO that way so that it cleans the venturi