Usually every day or two. It varies a bit, but if I go too far either way I feel out of sync - trying to jerk off more than once a day eventually leaves me feeling drained and needing to recharge for a few days, whereas repeatedly going 2-3 days without can make me feel distractedly horny.
(Case in point: I didn't jerk off for 2 days up to yesterday, which resulted in jerking off twice last night - which is rare).