The 10,000 hours rule
In the Early 1900's a study done by Psychologist K Anders Ericsson and his two colleagues at Berlin's Elite Academy of Music. They took a class of violinist and divided them into three groups. First group were the stars, students full of potential to become soloist, second group was accommodated with the average one's or the merely "GOOD" and the third was composed with students who took up violin just to become a music teacher at a public school.
All the students aged almost the same around 6 and had the same knowledge, even practiced the same early on. But as they went on a difference was noticed, the first group practiced more than the other two by more than 2 hours in a week and as they grew up to be 12, the first group practiced around 12 hours a week. The practice went up and up as they grew up to be in early 20's. The Star group grew up with the intent of only becoming better and better at their job playing more than 30 hours a week and the other two groups remained average throughout.
Ericsson during the study found a very interesting fact, none of the students in the 1st group reached the top without practicing for 10,000 hour despite of being innately talented nor the students in the 2nd and 3rd group by practicing 10,000 hours could breach the top spots.
Their research suggests that once a musician has enough ability to get into a top music school, the thing that distinguishes one performer from another is how hard he or she works.That's it. And what's more, the people at the very top don't work just harder or even much harder than everyone else. They work much, much harder.
From "Outliers" Malcolm Gladwell