When do you stop? Do you have a daily limit or something?
I really think that you should stop when you already know that gambling is not for you. Gambling depends on luck, and if you think that you're not that lucky you shouldn't gamble. Gambling can make your life miserable, it can even take away everything that you have.
it's simple when to stop, if you have no more money left on your wallet. Well, for me though I'm not as a good gambler, I will stop when I feel it's not my luck which I try to analyze the several games that I play or bet. I just depends on the way I love to play on that particular game, but I just limit my self to stop for a while in order to passed by some bad lucks that I've been feel. I don't want to wait to stop when it comes that I have no more money left here in my wallet.