I stop when I notice that on the day I played I almost lose my budget for gambling meaning I lose more than I win. Even though I still have a chance of winning because I still have a budget, I will still stop coz I am thinking that losing on the game on that day is already the sign for me that I am not lucky enough to win amd maybe I lose all my money
Anyone who is smart enough to at least eventually realize that should immediately know that decision on its own is a jackpot for them. People attach so much emotion to gambling and they make it seem like this is where their situation is going to be turning around for good without realizing gambling is just a game of luck and there is no guarantee of winning and there is actually even more guarantee of losing.
You will know when to stop when you already have the mindset that it is just a game and there is nothing much to get from it while playing with just the little you can afford to lose until you exhaust it.