Having spent 200 hours on the above, the young player, even if he possesses no special talent for chess, is likely to be among those two or three thousand chessplayers [who play on a par with a master]. There are, however, a quarter of a million chessplayers who annually spend no fewer than 200 hours on chess without making any progress. Without going into any further calculations, I can assert with a high degree of certainty that nowadays we achieve only a fraction of what we are capable of achieving.
Emanuel Lasker