I leave my 335 on standby all the time. This way, the warm-up time is 5 to 10 mins. From full power-down (to my ears) the warm-up seems to be approx 30 to 60 mins.
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I concur with Ikarus. I have ML 23.5 amps and leave them on 24/7 because I feel they sound better if I do. There is no standby setting on the ML 23.5 amp. There is a relatively sudden noticable improvement in sound (warm up time) after about 20-30 minutes with optimal sound being gradually reached after about 60-90 minutes. My ML dealer said that there is no problem leaving ML amps on 24/7 if you want to. Enjoy.