See also: http://norvig.com/21-days.html (Teach Yourself Programming in Ten Years by Peter Norvig)
10,000 hours is N hours daily for M years
3 hours for 10 years.
4 hours 15 min for 7 years
5 hours for 6 years
6 hours for 5 years
7 hours 30 min for 4 years
10 hours a day for 3 years
15 hours a day for 2 years
Just incase somebody wants to pick up a new skill =).