HifiDIY TDA1541A DAC Kit Leaving it on at all time?

[HP8903B]

I got a TDA1541A Main DAC board.
Is it better to leave it on at all time or 2 hours of warm up time is optimal?
I am referring to just the main DAC board that has the TDA1541A on it.

The DAC that I have leaves the digital board energized at all time.

 

[nikkon]

Hi, i have a TDA 1541A too.Myne is home made and has a tube buffer too.My outputs are before and after the tube just in case you wanna see the differernce and stuff.Is no need to warm up for the tda (5-10 min is enough), but in my case the tube must stay at least 1 hour.