In Malcolm Gladwell’s book Outliers: The Story of Success, he stated that to achieve mastery in an area, it generally takes about 10,000 hours of serious learning, practice, and skill development.
I think it’s a valid conclusion, but there’s more to the story.
If you want to be famous for something, to be at the forefront, you have to establish yourself as world class. You want to be one of the best violinists? 10,000 hours. You want to make a living as a pro golfer? 10,000 hours.