Once a day - average
Twice a day - when I'm bored
Thrice a day - when I'm really bored / a little horny
Four times a day - when I'm REALLY bored / quite horny
Five times a day - when I'm really fucking annoyed/stressed
Six - when I see a lot of good material
Seven - rare occasions.
Once I masturbated 10 times in one day when I was 13.