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.
My choice is a variation of option
b.Losing bankroll is a sign that need to stop, but without blaming the casino. Why blame it if it is a "regularity" when the casino's role is to "pull" money out of you. Blaming the casino for this is like blaming the sun for shining and the wind for blowing. That is, it cannot be changed in any way, but can only be taken into account as a very important factor in gambling activities. In the case of gambling, it is always "to be on guard" and remember that the casino is not a place where money is simply given away, but a place where they will try to take your money and you will have to snatch the "victory" with force.