This story below is interesting because it makes you wonder if you really need 10,000 hours to get great at something or you if just need to be obsessive about a subject.

Yes, this story is anecdotal but it's still worth considering. Here's a good quote from this article.

The Dan Plan crystallizes the sheer number of variables, beyond deliberate practice, involved in attaining excellence in a field—not least, reliable access to effective instruction and the support system and motivation provided by a cohort of peers striving toward the same goal.

The Dan Plan