As the questions says, when do you stop? your point of no return?
a. at least double your money, then stop
b. you only stop when you have lost all your bankroll money and then blame the casino?
c. or you are a superstitions gambler, when you have signs like losing 3 straight in a row, then you quit because you know that you're having a bad luck
d. you stop when you are at least break even
I didn't include chasing your losses as obviously you might to continue.
A real gambler will never give up gambling. A real gambler knows that losing is part of the game and there is no need to be discouraged. A real gambler knows where to stop and where to start again even if he wins repeatedly while gambling. Those who do not have self-control over themselves always make wrong decisions and repeatedly face financial losses. We should stop gambling sometimes to keep control over ourselves, if we continue gambling in one way, it increases the chances of losing our money many times, so it is wise to set aside time and money before starting gambling. In order to manage gambling properly, it is wise to create a fund to deal with unknown dangers and this means keeping it separate from our fixed expenses and always maintaining our self-control while betting.