Depends entirely on your curiosity, motivation and energy. The answer could be "less than four years" or "a lifetime." Everything is "self taught" when you ge

Depends entirely on your curiosity, motivation and energy. The answer could be "less than four years" or "a lifetime." Everything is "self taught" when you get right down to it. The only difference is whether one has/needs guidance about what to study, and advice from others with more experience.