@Pianolilly: I read that quote differently and from Paderewski: If I don't practice one day I know it, two days the critics know it, and three tdays the public knows it.
@Sevencircles: I don't agree. I think Horowitz did have a huge repertoire. And about Hamelin, I don't think he's a mediocre player. He has one the finest techniques ever seen, but musicaly he's great as well I think. True that he doesn't practice that much, but he has a phenomenal memory, and can learn extremaly fast. So probably he doesn't have to practice the same amount of hours as an other pianist to achieve the same, as he's super effecient.