I had the opportunity to listen to the 2250 for a week or more while it was enroute to its new home on Long Island

I left it on continuously as well, never ran warm no matter what I threw at it. Sonics were wonderful top to bottom with bass control almost as firm as the big switching amps! It just seemed to be idling along with a "what me worry?" attitude! The only amp that I've heard in my system that equaled it was a demo AKSA 100N+ which, in my system, was magical! I have/had a VAC Avatar, a moded Carver ZR1000 and various 3886 chip amps (single and bridged) on hand at the time. Also had an big cap Odyssey Stratos previous to the Avatar.
HTH...
Gordy