A few months of kindergarten first, which (for assorted reasons) then motivated about eight years of mostly self-directed homeschooling, followed by about 5 total years of community college + undergraduate university (in which I learned very little). Rounding up I guess 6yrs of typical schooling would be more accurate, but I could probably justify discounting the university years somewhat given that less time is spent in-class and 80% of what I learned I did on my own, outside of coursework.

I've considered grad school but I think at this point I'm too set in my autodidactic ways to adjust to the demands of an academic environment.