On average 1-2 times a day. Sometimes three. My record was 8. That was when I was a teenager...waaayyyyy more energy back then. HAHAHAHA. On the 8th one, my testicles actually hurt. At that point I knew that was enough for the day.
Too much, I used to do it a day (or several times a day). I've stopped alot since I got a girlfriend. I try to control it unless I'm really horny.
Well, guys... what can I say, I'm nothing compared to you who do it on daily basis (LoL)... Although my record is thrice in a day. But at regular, once a week suffices me.
I have up to 5 proper sessions a day (ie to orgasm), but as I am always naked at home, whenever I'm in my chair, working on the PC, I usually find myself unconciously fondling myself - normally in a flaccid to semi-erect state. I don't know if you would consider that as being masturbation though.
Most helpful advice I ever received, fortunately at age19, was to separate fucking from wanking, ie. consider them as two different forms of sex. Took away guilt building up from masturbation alone following a full and explosive evening of 4play, intercourse, and some kind of 'quickie' as we were saying our good nights. I've never considered one as substitution for the other, nor one as 'better' than the other. Just different! Adviser? Good old Grampa S., God rest his honest soul. So daily (or more) remains my comfortable practice of choice, regardless of other accomplishments - unless totally bushed.
i masturbate like 20-30 times a day when i have nothing to do but normally like 5 times on a busy day