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

I leave my system powered up 24/7 including a tube line stage and a tube rectified outboard SACD player power supply and tubed analog board in the SACD player.  I leave mine on for the same reasons as @soix mentioned above.

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.