How long does it take your tube amp to warm up?

When I had my Viva, it was 45 minutes. Now I’m putting together an Audio Note system and I find it’s about 2 hours.  Peter Qvortrup leaves his tubes all the time I think. But that’s not a good idea for most people. 

Turntable grease bearing takes 20 minutes to "warm up." By the time that’s done, all tube amps (RIAA/preamp/monoblocs) are ready to go. While things are technically available after 2 minutes, sound opens up and has more musical coherence after 20 minutes, and gets better by the hour. After 3-4 hours, system sounds best.

About 45-60 minutes for VAC Avatar SE, but you can listen to it after 10-15 minutes.

I don’t have any reliable way to determine how long it takes for the system’ to sound its best.  It sounds good enough to enjoy within 20 seconds or so, and pretty much like it always sounds within s couple of minutes.

From my experience, it doesn't matter how long you let the tubes warm up. The amp won't sound its best until after 15 minutes of signal has passed through it. Ten minutes of idle is all it takes for a KT150 (the highest power dissipating tube out there) to reach operating temps, so I assume all other tubes require less. You're just killing tubes by letting them idle for hours before playing.