When you turn off an analog synth that’s been on for a while and then turn it back on, does the “warming up” process start over? Or does it stay “warmed up” for a while?

I have a couple of gigs coming up and I am wanting to integrate my Model D into my live setup. Tuning-wise the Model D is less stable than my other gear. If I plug it in during setup for a half an hour to let it warm up and then move it into my rig and half to unplug it to plug it into a different power outlet, will it remain warmed up at all? Or am I basically wasting my time trying to do that?