When I worked in an office I'd take a guitar with me and practice around work. If I arrived early, get a few minutes in, then a bit more over lunch.

I'd practice in the evenings but I had rehearsals, gigs, lessons and whatever as well. Balance is the thing. I rarely play acoustic, so don't touch that much, but I play every day probably 2 hours minimum. I'd separate the two as Benoit said though...