For me, it's not "how often" but "what type" of shooting.
I am a defensive handgun fanatic, and hate to visit my range when it is busy....since it eliminates my opportunity to go forward of the firing line and work on defensive drills and movement.
So, I go at odd times (during rain storms, early weekday mornings, holidays) to insure an empty range.
Shooting from 25 yds at paper just doesn't do it for me!