Normaly it stays in standby when not in use, because I have it in a office next to the living room. So right now the Amp is on, speakers is not humming, but the Amp itself is making alot of noise. When in stanby the apm is in total silence. It only takes a few secons to go out off stanby.
It my amp was in a room that I didnt use often it would not be a problem.