Does anyone leave their amp and preamp on all the time?

I leave my equipment on 24 / 7, it is ss. I have many amplifiers, but none have a stand by circuit. My understanding of a stand by circuit is very vague. Does stand by and being left on give the same warm up benefits ?

My last 3 systems, I left on all the time.  My 2 newest systems, I shut them off.  My 2 newest systems are McIntosh which has connections to turn on all their equipment by daisy chaining them together.  I flip one switch on the preamp, and the amp and tuner both fire up.  I leave it on for 15 minutes or so before I sit down to listen.  Since I am not leaving  everything on any longer, my electric bill dropped almost 25.00 a month and that is even after the rates have gone up.

My Job Pre 2 does not have an on/off switch so it is on all the time per design. My power amp (Job 225) is on only when I am playing. Takes about 1 CD album length to warm up.

In my previous set up with Hafler 913 pre amp and 9303 power amp, on several occasions I forgot to turn them off for a week or so, after a weekend of play and didn’t realize I forgot to switch them off until the following weekend. The pre-amp sat on top of the power amp and the rubber feet melted over the years.

I leave the preamp on all the time unless I'm going away.  The Schitt Mani and Modi Multibit also stay on constantly.  The amp gets turned on when I'm listening.  The reason I turn it off is because a transient or amp failure could have me coming home to a set of blown Martin Logans.