Everyone can relax. xsphat was just throwing guesstimates out there. However, this IS a keyboard forum, after all. People here care about WPM and it's natural that they would be interested in a professional writer's WPM. I type at 80 WPM and I'm not very fast among this crowd. Therefore 300 words a day is obviously not that much typing.
Another thing to consider is that if I was to type a million characters into work (be it code, a novel, whatever) then I'll bet that less than half of that makes it into the final product after editing/reviewing/etc.