I'm using class D amps and they usually stay on 24/7, so does the Pass B1 preamp. I only turn them off if I leave for more than 24H. And when I do, it sure takes a little while to fully "bloom" again.
Believe it or not, the only device I turn off at night is the DAC, because it draws more current than the rest (crazy, huh) and has this fluorescent display that you can't switch off and is, as all fluorescent displays, prone to aging.