How long it take before your system/amps sound

I let my car idle all the time because it just runs better and hey, I can afford the gas.

In all seriousness...or maybe a little seriousness...my old Forte' 55 takes about a half hour to get the mojo. Leaving everything on all the time is simply a shameful waste about which anybody who does that should be ashamed...or at least not admit to it in public to avoid the "wasteful douchebag" moniker. Really...really? Many modern high end amp designers (Krell, D'Agostino, etc.) are taking this into account (and being forced to by new EU standards) and have some pretty hip energy saving stuff emerging, and nobody suggests leaving tube gear on.

The lighted displays on everything else (coffee maker, stove, microwave) seem to go on forever so I can assume hifi stuff can also. That doesn't mean it will, but it's a comforting thought.