Use pink noise disc to warm up stereo

While I can't speak to your stereo, my experience is that it just needs to be on to warm up. Pink noise, though, is allegedly good for breaking in signal cables, where a signal needs to be passing through the cables. 

I'd be interested if you notice a difference between warm up with no noise and warm up with pink noise..

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.