I'd heard that 10,000 hrs or the equivalent of approximately 5 years of full time work was the milestone to be a master of the skill. But of course.... practice alone doesn't make perfect as the saying goes. Only practicing perfectly makes for perfection in time and mastery of the skill.
I too have heard this "10,000 hour rule". Not sure if it's universal. Some may achieve mastery in less time and certain high-intensity professions like medicine may take considerably more time; 5 years won't even get you out of college and then there's the work of keeping up with the new developments.
In any case, having crisp goals that you hold yourself accountable for is valuable. Personally, I have a goal of learning and recording on my bass, 100 classic rock songs and 100 smooth jazz/ambient favorites. I'm only at song #7 on the rock songs but hey, the journey is as important as the destination
