I had excellent high school coaches who taught me how (and the "why") to play the game instead of just focusing on one singular season. There was a development process.

Then I was fortunate to work for both Coach Greenberg at VT and Lebron James' HS coach (Keith Dambrot) at Akron who were both excellent teachers of the game. Also some great assistants on both staffs who could show things in film work that I would have never noticed.

So the short answer to your question is about 2 decades