In my case I've found that working each bodypart once a week has given me the best growth. Before I was working out maybe 5 - 6 times a week and at first I experienced growth but then it slagged. I've now dropped to monday, wednesday, and friday.
Mon = chest, shoulders, forearms
Wed = legs, abs, litte forearm exercise
Fri = biceps, triceps, back
One downside though is that I get bored on the days that I don't workout

so I might do some cardio in the morning of off days (never more than twice a week). Just something to think about. Good luck.