Unfortunately, this rule - which is the only thing…
Unfortunately, this rule - which is the only thing that many peo ple today know about the effects of practice - is wrong in several ways, (It is also correct in one important way, which I will get to shortly.) First, there is nothing special or magical about ten thousand hours.
— from The Instruments (Awareness/Perception/Expectations) · Peak: Secrets from the New Science of Expertise by Ansers Ericsson and Robert Pool