Crash, roulette, dice and slots. You can win instant profit BUT that is if you're lucky to win. Most gambling games are luck based hence you cant expect to win in these games if you're not lucky. If you're not prepared to lose then dont gamble, because the chances to win depends on the game that you'll play (since there's a chance based and skill based) and of course luck. So gamble with less expectation and in moderation.
Dice is an instant win together with the others that have been mentioned. But gambling at that pace will make you lose the most that you've got.
You can think of how fast you can win but also you have to think on how fast you can lose also with everything that you've got.