The question here is how do you relieve your excitement? Do you continue to play or do you stop there? The particular habit I observe in gamblers, professional or amateur, is that they are concerned about winning but do not feel the need to relieve their excitement. They are prepared to lose money and in the same way, they avoid limitations in order to earn money from gambling.
I feel excitement every time when I lose or keep winning. Do you also feel excitement when you win or when you lose?
The excitement of winning is really overwhelming and require lots of discipline to stop at that point before incurring lose weightier than the win.
But I think why some can't or won't stop is not all about the excitement but is about the greed of wanting more when it is even obvious that the next try is totally uncertain and blurry
The best time to stop is when you are very excited about the wins at that point a break is very essential, because not stopping there can ruin everything and bring torment or torture of loosing
If you ask me when is the best time to stop, I will say it is when you are high on the joy or excitement and calm down before going again but not same day or even week