It takes 10,000 hours to be a master

I read recently that it takes 10,000 hours to master anything. Piano, acting, sports, whatever, you have to train you mind and muscle memory to perfection.

This sounds daunting, but it equates to about 10 years of dedication at about 3 hours per day and it matches well with the "mentorship" model throughout history of taking 12 years olds and dedicating them to the skilled profession of the times for about a decade.

It also sparks an interesting question -- what are you a master at (e.g. have spent 10,000 hours on)?!