My friend and I used to masturbate, and discuss masturbation quite openly with one another.
One day he asked me how often I masturbated. At the time, I did every other day. He scoffed and said he did at least once a day, twice if he got the chance (this finally explained why my loads were usually bigger than his). This caused the subject to change to how much we masturbated when we first discovered how to masturbate. I said, 'way too much, at least twice a day, and three or four times on a saturday or sunday.'
He simply laughed at me and then said he would masturbate at least seven times a day when he was 13. I demanded to know how this was possible. He explained: he'd start by taking care of his morning wood as soon as he woke up. Then, after breakfast, he'd squirt one in the shower before school. At school, when the lunch break came, he'd go into the bathroom and rub a shot out in the stall. Right after school, he'd relieve his balls again as soon as he got to his room. A couple of hours later, just before dinner at 5:30pm, he'd have another orgasm. Almost immediately after dinner, he'd stroke himself to climax again, and then finally just before going to sleep he would rub himself off one last time.
Naturally the fact that he didn't feel as though he had to hide it from his parents made this possible. He also confided that his penis was sore a lot and his foreskin chafed but that the orgasms were good enough that he would suffer a little bit for them. Also, his biggest load would be in the morning (and it was always just a couple of really short squirts), and by the end of the day, little more than a drop would fall from the tip.
I was amazed by his claim, and based on how much he loved masturbation, I believe it to this day.