A long list of studies available here:
“For example, the critical difference between expert musicians differing in the level of attained solo performance concerned the amounts of time they had spent in solitary practice during their music development, which totaled around 10,000 hours by age 20 for the best experts, around 5,000 hours for the least accomplished expert musicians and only 2,000 hours for serious amateur pianists.”
http://www.psy.fsu.edu/faculty/ericsson/ericsson.exp.perf.html

Your belief is not required, those are the numbers that have been consistently found through scientific study. It is also known as the 10,000 hour rule.
Sorry pal, but that's a load of crap.
Uh huh..... and your evidence is what?
Name calling may work in the school yard but I would hope you were planning on bringing more to the discussion. Even us hobbyists are hopping to get better at this game. Do you have some good studies to site? Can you site an alternative theory? Do you have your own hypothesis and suggested study?