What are the most blackjack hours someone put in in a calendar year? Most pros state 500-1500 hours. But if one plays just full time (40 hours a week) that's 2080 hours. If someone really is into blackjack i could even see them putting in 4000 or even 5000 hours in. Has anyone done this? If N0 is around 500-1000 hours, wouldn't this imply one could potentially double their bankroll 5-10 times in one calendar year (depending on game conditions of course)?