I always left my Pass gear on 24/7 because it just sounded so much better when it was hot. I remember my gear feeling pretty stable after a week of that.
I was instructed to turn it on for a week, 24/7, after which it could be used as normal.
I like to warm it up for at least 30 minutes (if I'm in a hurry) or an hour if possible, before listening.
I agree that it sounds best when hot. And it does get pretty hot!
I turn it off when I know I'm done for the day.
Awesome piece of equipment!
The model matters also. I HAVE A F6 and having the transformer adds to the burnin time
I have documented me and the Mrs. Which has even better hearing
Picked 10 specific songs played for 2 weeks have found refinement
Even approaching 300 hours now rock solid.
When warming up cold sounds brittle being pure class A.
An hour much better 2 hours better still, but we'll worth it .
You can leave on ,unless you have a tube Preamp ,to avoid a transient through speaker unplug one side of interconnect cable to amp after turning on preamp snd stable then plug the one interconnect into amp it is up to your preferences.