No... My system only takes about 15 minutes to fully "warm up" and sound right. And, even during those first 15 minutes, the music is still quite "listenable."
Do you leave your components on 24/7?
Lately I've been leaving my components on all the time, on the assumption that a) they'll be ready when I want to listen, and b) the on/off cycle ages the equipment (tubes, anyway) faster than leaving everything on. Is the latter a reasonable assumption?