Just wait for the winning time of your gambling session and after that winning time then its the time for you to run out of the site together with the money you are playing with or play with another site and aim for a specific amount of bitcoins.Because after that winning streaks in a site they will strike you back and take all your money,
I think the best time to leave the game when you won a lot of bitcoin and money. However; some people didnt stop in playing in gambling sites so that they lose all their money and bitcoin. Playing in gambling is too risky and there is a possibility that your money or bitcoin will not come back. Lastly, be smart when you gamble.