10000 Hours to Genius

The amount of time of dedicated, focused practice that is a requirement to become a genius at anything. Now the question whether genius requires talent to begin with - still appears to be open.

Can 10,000 hours of practice make a genius - out of anyone?

https://www.zdnet.com/article/can-10000-hours-of-practice-make-a-genius/

But - Dan quit after 6000 hours.

https://www.theatlantic.com/health/archive/2017/08/the-dan-plan/536592/

MJ notes - it seems that 10000 is not enough. It must be accompanied by clear purpose.