No rules. It varies by person. But if you are feeling sore or physically uncomfortable an hour or more later, you're doing it too often (or too roughly).

it depends on if you are a guy or a girl and it also varies from person to person. Like with me, I can go up to two times a day at the most but I have aceeded the limit and went, sometimes, 3 to 4 times but that sometimes isnt good. Masturbation, like all of sex, is related to many things, physical, emotional, psychological, social, ect. Too much masturbation can’t be determined only from the number of times you’re masturbating in a day or week. You need to dig deeper, and you can start by asking yourself some other questions about your masturbation habits: Is your masturbation causing you distress? Is your masturbation causing (unwanted) physical pain or damage? Is your masturbation getting in the way of your life in unwanted ways? Do you find yourself literally unable to stop masturbating? If you answered yes to any of these questions, then I would say it’s possible (but still not definite) that you are masturbating too much right now. This doesn’t mean that there aren’t other times in your life when masturbating everyday would be perfectly fine. It also doesn’t mean that there aren’t people out there who masturbate everyday (or more) and who are completely healthy and have no reason to masturbate less. Remember, there isn’t a magic number, and we all use sex differently. If you do think you’re masturbating too much (that is if your masturbation is causing you distress, or pain, or it feels compulsive, or it’s getting in the way of your daily life) it may be something you want to talk to a professional about. Be sure it’s someone who is comfortable talking about sex and isn’t going to make you feel bad for your healthy sexual expression I got this from http://sexuality.about.com/od/sexualhealthqanda/f/over_masturbate.htm so check it out. I didnt think that there was a too often or too much till I did my research.. and tada.. there is.. but I hope the best

Simply it is when you feel you need to do it in public.

There are no rules to how often one can masturbate. Rather or not your body can keep up with your desire, only you can know.