in outliers Where does the 10000 hour rule come through in chapter 3?

In Chapter 3 of "Outliers," Malcolm Gladwell introduces the 10,000-hour rule through the example of musicians, particularly focusing on The Beatles and their extensive performance history in Hamburg. He argues that it takes approximately 10,000 hours of practice to achieve mastery in any field, emphasizing that talent alone is not enough; instead, dedication and time invested in practice are crucial for success. This concept highlights the importance of hard work and opportunity in achieving extraordinary levels of achievement.