According to the new bestseller Outliers by Malcolm Gladwell 10,000 hours is what's needed to achieve mastery in any given area. And ultimately it's what makes the difference between an enormous success beyond any doubt and all the rest.

Gladwell explains that reaching the 10,000-Hour Rule, which he considers the key to success in any field, is simply a matter of practicing a specific task that can be accomplished with 20 hours of work a week for 10 years.
The Beatles performed live in Hamburg, Germany over 1,200 times from 1960 to 1964, amassing more than 10,000 hours of playing time, therefore meeting the 10,000-Hour Rule.

Gates met the 10,000-Hour Rule when he gained access to a high school computer in 1968 at the age of 13, and spent 10,000 hours programming on it. In Outliers, Gladwell interviews Gates, who says that unique access to a computer at a time when they were not commonplace helped him succeed. Without that access, Gladwell states that Gates would still be "a highly intelligent, driven, charming person and a successful professional", but that he might not be worth US $50 billion.
Summarizing the publication, Gladwell notes that success "is not exceptional or mysterious. It is grounded in a web of advantages and inheritances, some deserved, some not, some earned, some just plain lucky
What do you think? How many hours have you invested in your work?