OK to leave tube cd player on 24/7??

Hi I was wondering if it is okay to leave a tube cd player on all of the time. I think it sounds much better when it is left on. Turning it on a few hours before listening doesn't seem to do it. The highs seem much more harsh when it is first turned on. I don't want to burn the tubes out, though. Does each hour that the player is powered on without playing count the same as if the player is playing music? Also, how many hours does the typical tube cdp play before needing to be changed? I am speaking of the NuVista tubes in particular(not the TriVista). Thanks everyone for all of your time.
I have heard that nu-vista tubes are supposed to last for 100,000 hours, this is the equivalent of 11.4 years. I have a nu-vista as well and leave it on 24/7. I figure that in 11 years I probably won't have it anymore anyway, hope this helps
I used to have Sonic Frontiers SFCD1 and currently using Opera Reference CD 2.2.

I let it on and never turn off. Analytical tube usually have longer life. 6922 or 6H30 all are long lived.

Dont worry.

Keep it warm for the best performance.