From the post:
A study orchestrated by K. Anders Ericsson who looked at musical prodigies found the common denominator for mastery and success: 10,000 hours of practice. “The emerging picture from such studies,” says neurologist Daniel Levitin, “is that ten thousand hours of practice is required to achieve the level of mastery associated with being a world class expert—in anything.”
It'll take five minutes to read. I hope all writers will.