I think its something you have to literally "master" - malcolm gladwell's 10,000 hours are equivalent to apprenticeship - journeyman - master craftsman. After 7 years i felt i knew my job as a computer programmer. 7 x 2,000 is 14k. Well time off for meetings. And it takes 7 years for all the cells in your body to replace. Its not about just learning skills. Its internalizing it. Its being able to notice that you reacted differently without even trying, not just trying to control your reactions.