Being an expert means being noticeably better than non-experts. This will depend on how much you practice, how well you practice, and whatever relevant innate

Being an expert means being noticeably better than non-experts. This will depend on how much you practice, how well you practice, and whatever relevant innate abilities you have (appropriate personality, IQ, extra-sensitive hearing, tetrachromacy or color-blindness, etc). And also, on how well/much other people practice. Apparently if you fudge things just right, you get most people either not practicing well or losing interest shortly before 10k hours.