eta: Writing fiction I consider myself doing really well if I achieve 500 words in an hour. Non-fiction? 1000 is quite easily done.
I have never tried my hand at writing fiction, so I probably should shut up about that :) At the same time, I told / tell my kids bedtime stories that I pull out of my fantasy at the drop of a hat and they can go on for as long or as short as I want. But those are not to be compared to anything novel (or even novella) sized. 15 minutes tops.
When I was an analyst, my benchmark was about 2,000 "memo grade" words per day--typically mixed in with some phone calls, etc. More carefully constructed reports etc. took longer especially if research were involved.
Pages 31 Words 17212 Characters 97347 Characters excluding spaces 80354
Unfortunately I can not find exact statistics on the writing activity. So that's roughly within the ballpark of your maximum. I was pretty happy with this particular report and so was the customer, but to do that kind of thing sustainably would be beyond me.
Edit: and, more so because this was before COVID and that hit me pretty hard.