Three times a week, most of the time. Twice, on occasion, when doing total body workouts.
Monday:
Upper body
Wednsday:
Lower body
Friday:
Upper body
Starting the next monday, I reverse the order.
Monday:
Lower body
Wednsday:
upper body
Friday:
Lower body
I do not believe in splitting up any upper body muscle groups. Just my view, that's all. I work it as a unit. Same with legs. Usually 8 or 9 sets tops, on any workout. Good Luck.