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/

Dan's start: “The idea of talent is [like] living in a society of kings and princes,” he says. “If you don’t limit yourself by this idea ... it’s more like a democracy where anyone who’s willing to work [can] succeed.” Also: “People’s intuitions about practice are nowhere near optimal.”

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