Warm-up time for amps and preamps


How long does it take for your system to sound good from a cold start?
I try to keep my system on most of the time.  But occasionally I turn it off and it sounds like crap for a good half-hour to an hour.
i know there has been discussion here on the virtue of leaving tube preamps on all the time.
But my solid state amp (modified NuForce mono blocks) technician advises turning even them off occasionally.
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Leaving your system on all the time can dry out the electrolytic capacitors (even on tube equipment).  I would say this is not advisable.  You can leave it on if you want, but you'll wear out your caps in a few years or less.  On solid state stuff, I usually need about 45-60 minutes before it sounds best.
Mine is an all tube system and it comes alive after about 25 minutes and really shines at 45 to 60.
I have a tube preamp and a SS amp I turn them on an hour before I'm ready to listen.