823c4c54_aNobii___s_note__Outliers__Original_text
[0] 45 [Comment] Chapter 02: 10,000-hour Rule [Original text] 
To become a chess grandmaster also seems to take about ten years. (Only the legendary Bobby Fischer got to that elite level in less than that amount of time: it took him nine years.) And what's ten years? Well, it's roughly how long it takes to put in ten thousand hours of hard practice. Ten thousand hours is the magic number of greatness.
aNobii: 's note: Outliers
Original text