Possibly you will find my approach beneficial. I should add results will vary with specific components. Prior to installing my P15 sources and preamplifiers were energized continuously. The amplifier would be powered up in anticipation of a listening session. The solid state amp would settle in within 60-90 minutes, the tube amp under 60 minutes. Once adding a P15 serious listening sessions are planned with a 2 hour warm up session, typically streaming or FM radio. For a string of listening sessions, say several days running, I leave the sources and preamplifier powered up with the P15. I do hear a difference and recognize the need for my components to come into thermal equilibrium.
I agree with Elk’s suggestion, try various combinations and decide for yourself. I did not get the impression the P15 needs warm-up but that the source and preamplifier do indeed benefit from a warm-up. My impression is based on my pre P15 experience, so there is a bias for warm-up in my recommendation.