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

I have 3 Plinius Pre-Amps, a Plinius Phono Amp, a Plinius power amp and a large Perreaux amp and powered electrostatics with subs which all run constantly, Plinius recommend leaving them on.

I also remember reading that the heating up , cooling phases are where most component failure occurs.

The only time I turn them off is during a power blackout, as the return of electricity surge/brown power often is not clean.

Left my SA-9900 Pioneer integrated on for 32 years unless I left town was the only time it was turned off.  I have a 1980 mosfet SoundCraftsman that I never turn off.  My 77 Marantz I turn on the night before I use it.

Hi everyone this is my first post. I don't know if you're ever up all night but it seems like the electrical companies in my area must move power around at 3 or 4 a.m. which sometimes looks almost like a brown out by the time it gets to my house. I unplug all of my equipment when I'm done listening. If it's disconnected from Power surges and brownouts there is no way they can hurt you. I also have a recording setup which I connect to a few Tripp Lite dual conversion systems that create AC from DC I unplug those When Storms are coming. I'd rather wait for something to warm up then wait to buy a new piece of gear.

My Herron Audio M1 amps are on 24/7 unless I'm away for more than a couple of days.

I have a Bryston 3B-NRB power amp, more than twenty years old. The only time it’s been off in the last 7 years has been during power outages & overnight+ trips. It’s warm, but not hot. I’ve read of studio installations with Bryston gear that was powered on for over twenty years and still going strong. Bryston does have a 20 year warranty, so I’m not worried about anything bad happening to it due to it being switched on non-stop.