I think it depends on the gear itself and not so much a general rule.
The designer of my eXemplar Exception II recommends a 20-30 minute warm up before playing music through it and turning it off when not in use. Blue Circle makes a similar recommendation.
However, with some tubed gear I can perceive an improvement if it's left on continuously for a day or longer.
I use a mish mash policy. My tube DAC stays on all the time, but my tube preamp and amp get turned on Friday night if I plan on listening all weekend. Then Sunday night they get shut down until next time.
The designer of my eXemplar Exception II recommends a 20-30 minute warm up before playing music through it and turning it off when not in use. Blue Circle makes a similar recommendation.
However, with some tubed gear I can perceive an improvement if it's left on continuously for a day or longer.
I use a mish mash policy. My tube DAC stays on all the time, but my tube preamp and amp get turned on Friday night if I plan on listening all weekend. Then Sunday night they get shut down until next time.