I’d say(not being a dick)is how long for your ears to adjust.
My Extreme example is listening to a Tower of Power(live and in living color album)
That was 30+ yrs ago,couldn’t adjust to all the subtleties going on and thought WTF is this C - - - p.
Later Holy Crap SUPERB sound track Musicianship ect.
I turn on my preamp then amps 28s and it’s showtime.
The warm up is in my mind,
Never been disappointed yet.
If I’m not in the mood or some shit happens obviously the music Sucks,Guaranteed.
If I really had to feel I had to warm up my amps for I would be comfy with a half hour.
If I’m in the groove for tunes Now I(like above,turn on the Pre then amps.
I will say my preamp is on 24/7,amps nooooo as yrs ago I left them on and the hydro went up 60.00 a month.
Dac,Bdp-2 all 24/7 as they use very little power.
My oh my feelin like I got Ramblin fever
Thanks Merle.