"When it comes to understanding expertise and expert performance, psychologist Dr. Ericsson is perhaps the world’s leading authority. His research is the basis for the “10,000-hour rule” which suggests that it requires at least ten years and/or 10,000 hours of deliberate practice to achieve an expert level of performance in any given domain – and in the case of musicians, more like 15-25 years in order to attain an elite international level.
Those are some pretty big numbers. So large, that at first I missed the most important factor in the equation.
Via Maggie Rouman