My Nad c658 has an auto off setting that triggers after 20 or so minutes but it doesn’t seem like you can change this other than to disable/enable. No changing to say an hour it will auto off. At least 2 or 3 times a week I leave it paused for a couple or so hours w/ no activity. I emailed Nad who of course gave me some lame ass canned answer about the manual. They did not answer my main question
Can I SAFELY leave my c658 powered on all day?
(these things have a couple issues for anybody thinking about buying one. 1 Volume stepping sucks it’s so slow. OMG please give me a setting for that. 2 auto off 3 It may have it but I’ve not found volume limiting. 4 and this one also kinda sucks is it doesn’t work so great on a harmony remote. I’ve taken to using the 12v trigger. These things are minor compared to the good parts. I have annoyances but no regrets at all, I really like this thing.)