He worked out through his research that if you spent 10,000 hours on your passion, you would reach a level of mastery in your field.
Get Off Your Butt And Work 5X Harder — Here’s Why
Tim Denning
2147

I like the Gladwell book, but a better book is by Robert Greene called “Mastery” … the examples he uses are brilliant. He somewhat breaks through the 10hr myth (because depending what you are attempting to master, it may take 100K hours, or 10).

https://www.amazon.com/dp/B007V65PBK/ref=dp-kindle-redirect?_encoding=UTF8&btkr=1

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