How many hours have I spent on maths?

(or, rather, How many hours have I spent explicitly doing maths?)

1. Formal education
   • Preschool. 300 hours of counting?
   
   
   • Primary school. (4? per week * 40 weeks x 7 years) = 1100
   
   
   • Secondary school (6 years)
     S1+S2: (3? per week * 40 weeks * 2) + homework (80), revision (40) = 360
     Standard Grade: (3? per week * 40 weeks * 2) + homework (160), revision (50) = 450
     Higher Maths: (3 per week * 40) + homework (100), revision (100) = 320
     Physics: (2 * 40 * 1) + home (50) + revision (50) = 180
     Chemistry: (2 * 40 * 1) + home (50) + revision (50) = 180
     =~ 1800
   
   
   • Higher education
     Economics = (4 hours * 24 weeks * 4 years) + homework (200) + revision (200) + thesis (100) = 900
     Cryptography = 100
     Half a BSc in Maths = 16 hours per assignment x 23 assignments + (60 hours study x 4 courses) = 600
     ~ 1600
   
   ~ 5000 hours.
   
   
2. Researches
   My own writing hasn't been very mathematical so far. But I've done a bunch of recreational bits and warmup pieces, and read books like GEB and Chaos.
   ~ 200 hours.

So I am supposedly halfway to Gladwellian mastery. Sure doesn't feel that way; but then, the first two-thirds of those hours were undermined by their being coercive and applied to a formless fog of feeling, me as a child. And I have scarcely ever been 'deliberate' about it.