My system overall needs about eight hours to fully open up.
It's easy to know, it always sounds thin, closed and clouded when first started and the next morning is wide open when I leave in on overnight.
The speakers have two internal digital amps each. And when I turn them off and restart them, there is a noticable choking of the sound. It generally takes a few hours to return to the prior sound.
So, I leave the system on fulltime except during electrical storms.