To give you my best guess as to the time it might take you to learn the g min. ballade (and again having never heard you play, such estimates are very likely not accurate):-maybe 3 months (assuming a good hr+/day on the ballade) to have it reasonably under your fingers.-maybe 6-8 months to have it really comfortable under your hands, with very few if any mistakes.-but probably only like 3-4 months to get you to that point if you have a teacher to see your mistakes for you, and who ostensibly would have the appropriate solutions in those situations.