I usually play/practice several times a day. The first is usually after I finish my coffee and have read the newspaper. I alway keep one or two guitars in sight and will have 1 or two more sessions throughout the day. Each session is at least a half hour and varies with some combination of the following:
Finger exercises (spider walk)
Review & practice current TAC topic(s)
Practice some chord transitions (G to Dm vexes me)
Practice and add a bit to a song I am learning.