4 hours total of pure undeniable work throughout the whole day (so wake up to sleep). K. Anders Ericsson, a professor on the study of “expertise”, notes that th

4 hours total of pure undeniable work throughout the whole day (so wake up to sleep). K. Anders Ericsson, a professor on the study of “expertise”, notes that the best violinists in the world top out at 4 hours of practice. So I don’t feel guilty after 4 hours. Another thing Ericcson noticed, the violinist who practice the most and are the best take midday naps.