Use pink noise disc to warm up stereo

Of course it depends on the equipment. Tubes definitely need to warm up. Most SS designs should not change audibly if they are well designed and working well.

Mine starts to sound ok-ish after 45min. but really starts to shine after around 2h. I have SS gear!
I guess it depends upon how transparent a system is and how experienced your ears are...

Unless it's tubes, just leave it turned on. Completely eliminates the issue......

The reason I went to the pink noise is that “just leaving the system on” had little or no effect. Really comes to life with the pink noise warmup after about a half hour or so.  Just playing discs as normal takes more than an hour, sometimes two, before I’m really enjoying it.
This may be just my set. I have a CJ tube preamp and NuForce monoblock solid state amps.

Haven’t done any FDA-mandated, double-blind studies but I’m of a similar opinion as RVP. Processing signal vs simply powered up seems necessary to reach some kind of optimum performance level. Pink noise getcha there faster than music? Dunno, but track 9 from the XLO Test and Burn-In CD is the weapon of choice. Have been listening to a low power Class A ss amp from First Watt over the last week or so. Less than 100 hours on it now. It sounds good after the first hour playing music but after 6+ hours or so, it is really magic...or at least that’s what I think which, ultimately, is all that matters in this pastime.