It's actually 2.7 hours a day, every day for ten years. If you spend 40 hours a week (8*5) then you can be a master in 4.8 years.
So, for me by those metrics I have mastered:
Black and white photography, particularly printing. (20+yr)
Baking (5yr)
Bicycle Mechanic (5yr)
Cabinetmaking (5 yr) There is some overlap as I have been practicing photography since I was 12 and would still spend 4-5 hours a day after work when I had other jobs. When I did photo full time 12-16 hour days were typical.
As you can see, I have a long way to go before I'm at Z
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