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 stop when my spins have been exhausted. It doesn't matter whether I lost or won.. As soon as my spins are out, I am out. No other thing on the list counts. Those you did those still lost more than they would if they just stopped when their spins (in casino) finished.