Which of the gambling game do you think that is the fastest in [bringing profit] base on little time duration
Well, there is no such game that fastest brings profit as I highlighted above. In fact --not all games will bring you a profit in just a quick snap of a finger. Games like dice, slot and other games that are under by the bankroll or you are fighting against a house edge that the most considerable as instant games by when you say fastest bringing profit, that is impossible because there is no guarantee about the profit. We can called them the fastest games but not the fastest making profit.
This is how newbie expect from a gambling site and they fantasize to earn passive or huge money when they play, but unfortunately they mostly lose all their money since they face the reality that its not easy to meet their expectation on casinos. So maybe they should lower down what they expect and just have fun playing because this is more worth it rather than chasing winnings.
They have little knowledge about how the casino works as if it's designed to make money for newbies like OP but in reality casino will always be the same reason why so many gambling addict losses almost everything because they think they could take back what they've lost by expanding their betting habit.