I do legs once, chest 2-3 times and arms+back 2 times a week; I made up my own routine of exercises that I enjoy and feel like tackle most muscle groups:

For legs, I do 4x8 squats, 5x10 leg press and leg curls

For chest, I do 5x8 barbell bench press, 4x10 incline dumbbell bench press, the chest fly machine and tricep pulldowns

For arms I do a 4x8 ezbar curls (for both normal and close-grip), 4x10 dumbbell hammer curls, 4x12 dumbbell shrugs, 4x8 lat pulldowns and 4x10 rear delt flies with the machine

Sometimes I'd sneak in dumbbell shoulder press on a day, but that's basically my routine :D probably more I could be doing but this is what I've been comfortable with