I agree with GMW, 10 books is a million words, near enough, and that's a lot of typing. Lots of people can't handle that much typing in a reasonable amount of time, or at all, because of physical limitations.
As for speed, I could probably write 2-3 novels a year and have them come out pretty readable. Two problems, one, I don't have the time to write that much fiction at the moment, and two, it's taken me 25 years to get to this point.
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