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I owned one for many years- a very fine amplifier. I never got noises from the speakers after shutdown but I also used an Adcom speaker selector and Adcom power supply (still use 'em BTW) so that insulated them (I shut off the speaker connection then the amp). It would be unusual for any amp to continue to deliver enough power to make noise through the speakers after you shut it off so you may want to check it or put in a switch that decouples the speakers.
I don't think it matters if you leave it on for hours or days but it was never recommended that I know of and I personally wouldn't do it if I were leaving the house because it's a fire hazard.
I have another transistor amp now (an MC602) and I don't leave it on all the time. There's nothing in the McIntosh literature that says you should. I defy anyone to hear a difference between just on and on for a long time.
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