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?
I didn't include chasing your losses as obviously you might to continue.
For me, I can literally just say I have got just two patterns to which I usually place my bet, and which is to either stop after I must have won a huge sum of money or stop after I may have exhausted my intended bankroll for the day gambling session. Because I'm literally that type that usually don't deposit huge sum into a casino at once for gambling, so as not to be carried away, but will rather prefer to deposit bit by bit, in other to avoid the urge of trying to chase loses after I may have lost my ticket while gambling. And moreover, everybody must not always have the same exact pattern. As it's advisable to use that which works best for you.