The "10,000-hour rule" is often misapplied. The reasons (as described in the article linked below):
1. The number 10,000 was chosen arbitrarily.
2. 10,000 hours was only the average.
3. Practice itself isn't enough.
https://www.inc.com/nick-skillicorn...to-the-people-who-wrote-the-original-stu.html
But regardless of what "magic number" one chooses (or doesn't), I think the third point is the key. The original "10,000 hours" was based on
deliberate practice. Although there are even disagreements about how "deliberate practice" should be defined, the main point is that it's
not just about "putting the time in" -- it's about the
quality of that time, how you use it... what you do in a
focused, deliberate way to improve your skills.
For a trader, that means that XX,000 hours of simply being "an active trader" won't cut it! Instead, becoming an "expert trader" ( = consistently profitable trader) will require focused, intentional practice at improving your trading skills and knowledge -- things like actually having a plan, systematically analyzing/assessing your results (preferably with the guidance of an expert mentor/coach), taking specific actions to fix your mistakes, repeatedly performing desired skills and processes, researching/reading, etc.
Just sitting in front of your computer "trading" every day is not enough, any more than "going golfing" a few times a week and hitting balls at the range will eventually make you a competitive-level golfer... much less a PGA contender. For many of us, it means we need to do more of the tedious, boring stuff that isn't as "fun" as sitting at our computers, engaging in trading chats/forums, and watching the market and taking trades... !