The “10k hour rule” is a learning misconception popularized and echoed by some authors in recent years. This is what the research truly found on learning and mastering skills.
The idea behind the 10k hour “rule” is that it takes 10.000 hours of practice to reach mastery in any field. This is a misrepresentation -turned into a marketable soundbite- of a serious and thorough research led by an authority on deliberate practice and expert performance, K. Anders Ericsson.