Almost all poker players suffer from a common malady – they overestimate the effect of luck in the long run. While anyone who is losing after 100+ hours is probably kidding himself when he blames his bad cards, because it is much more likely he's not playing well enough and aggressive enough to win. If you don't see an upward trend on your data graph after 100-150 hours ..., fuhgeddaboudit !! ..., you don't have much of a shot and be in for a surprise of a lifetime when you'll be losing all your money no matter how hard you've trying to win.