Better sounding after 1 hour

All electronic component parts operate best (at their desired specs) when they have reached thermal equilibrum. I will let my system play for 30 min or more before begining a session.

Yes. With tubes is it always the case. It depends how long it takes, if the tube amplifier has an automatic bias it is much shorter.

Tubes 1 hour; solid state 2 hours.

I leave solid state parts of my system on 24/7 and I can hear a difference if unplugged for a bit to swap something out and then replugged. It really takes a full day to get everything sounding good again, especially toroid transformer gear. That's not scientific, just my experience. Tube gear sounds good after an hour but great after two or three so I turn it on when I walk in the door and then by the end of dinner, listening is wonderful.

My tube amp (and everything else) are on initially for background music so it's generally plenty warmed up for active listening. Leaving SS stuff on all the time is utterly wasteful and to admit doing that these days is kinda lame.