- The 80/20 method: You can get 80 % proficiency in a subject in about 6 - 12 months.
- The 10,000-hour rule: You can become an expert at something if you spend 10,000 hours of deliberate practice on it.
To go from zero to 80% (good enough) requires a different approach than that needed to get from 80% - 99% (world-class). The last 20% also requires a different level of commitment. For instance, Stephen King spent 6 - 8 hours daily for ten years before he succeeded as a commercial writer.