The 10,000 hour rule is something I first came across in college – the theory proposes that unless you complete 10,000 of practice you cannot attain mastery of a skill.
The 10,000-hours concept can be traced back to a 1993 paper written by Anders Ericsson, a Professor at the University of Colorado, called The Role of Deliberate Practice in the Acquisition of Expert Performance.
It highlighted the work of a group of psychologists in Berlin, who had studied the practice habits of violin students in childhood, adolescence and adulthood.
All had begun playing at roughly five years of age with similar practice times. However, at age eight, practice times began to diverge. By age 20, the elite performers had averaged more than 10,000 hours of practice each, while the less able performers had only done 4,000 hours of practice.