to know when we have to stop, you must have realistic targets when wants to play.
because if we do not have a target, it is hard to know when to stop. because every gambler always have a level of emotion and greedy is high, especially when in a winning situation.
Yea, you are right. My strategy is to play for short time, take profit and get out. I'm always watching videos on youtube to learn more strategies and hints to make more profit safe. A good one is to play for only 10 minutes, with a big bankroll if possible, and cash-out after.
And always change the rates.