Quote from Ivanovich:
I've probably studied porn for 10,000 hours. Does that make me a master of it?
No but it will fuck up your sex life. Quit porn, use real women - I bet 10,000 hours will make you not just an expert but very happy

Back to trading & other normal skills. I think the 10,000 hours, it depends how you spend it. For example if you just play guitar in a band for 10,000 hours, you won't be as good as if you spend 2000 hours playing and 8000 hours practicing. IMO it is practice & learning that improves your game the best. I'd say 1 hour of study & practice is worth about 5 hours of experience. The reason is that the former is specifically designed to improve your skills and learning, the latter is simply implementing them.
I know that when I review my trades, try to test new methods etc, I learn much more, much faster, than if I just stare at a screen trading.
So probably to be a great trader you need 8000 hours practise/study/testing and 2000+ actual trading. With 10,000 of just trading, you will probably be a decent but not great trader.

that was just one of the busines I Was in , and it was 1999 ,and I Was 19 back then. You could pickup amazing expired one word domains back in the days...