It all depends on what games you play. And of course how high you choose your stakes. There are hardly any upper limits on winnings. For example, if you play a progressive slot machine like Mega Moolah , winnings in the tens of millions are possible. There were already approx. Won 20 million in one fell swoop. The important thing is that you pay attention to the payout percentages of each game. The developers are obliged to indicate these quotas.