That's a fair point. A lot of people could probably motivate to do an hour of math a day, just like they could to do an hour of exercise for an hour or practice

That's a fair point. A lot of people could probably motivate to do an hour of math a day, just like they could to do an hour of exercise for an hour or practice an instrument. OTOH I would never be independently be able to motivate to do 4-6 hours of math a day, which is where I'm at now. Actually the instrument analogy is apt--the world class concert musicians you see on Youtube are practicing 5 hours a day. The guy down the hall banging out a Chopin prelude practices one. Both are "good" musicians, but only one is great. It's a question of what you're looking for.