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.
I don't really have a particular time to stop gambling, it's just a mixture of different options. Something when I double my money I stop. sometimes when I lose often than win. I also stop when I win couple of time, I feel that continuously playing will result to more loses I stop. Sometimes when I am beginning to chase after loses I also stop.