Central research finding is that no one becomes a world class expert without 10 years (10,000 hours) or more of intense attention and practice in the domain of their expertise. Dr. A. Ericsson, "The Road to Excellence". in Golf, the research shows that 10 years is a minimum and the actual time as measured by when a player wins a Major on the PGA Tour is 20 years and the LPGA 15 years. individuals develop expertise via deliberate practice and planning.