In a way, 70,000 hours is a lot closer to the true number.

(365 days) * (24 hours) * (12 years) = ~105k hours, or 70k waking hours

It isn't until fifth or sixth grade that you can really start finding a passion.

I'd say I managed to spend 5k to 10k hours on learning about technology and programming. I had to completely ignore high school. I literally slept through it. Teachers gave up trying to get me to try; I was also a social outcast.