the longer the time you spent the more you lose, this is the truth that many gamblers won't accept at first until they realize it later.
Not true at all. High rollers have a large bankroll and because of that they almost win most of the time in their session even playing for several hours and even a whole day with only a few breaks. Even a gambler only spends a few hours in their gambling session, but risking a high bet amount per spin, then what's the sense of doing it within a short time if the risks are just the same as usual?
It's not about how long should we spend time on gambling but rather just knowing how to stop for a while.