I've honestly never timed myself. I do know I've done 10k+ in one long marathon session, but I really never kept track. That was up early one morning, no work, nothing going on the next day guaranteed (what I call a "good" day). it involved 2 or 3 pots of coffee, and it was an all day and into the evening sort of affair.
I know one *insane* session, produced an entire "section". which was tens of thousands of words. But, the editing time? really long later on down the line. That took something like 36 to 48 *straight* hours. Wired like a flying insect caught in a bug zapper. we're talking pots of coffee left and right. Energy drinks. Cigarettes like a chimney, and yeah, a few shall we say "hand rolled" cigarettes if you catch my drift and I think you do. we're talking novella length here. But "rough" was not even beginning to cover it.
but in those days, my rough draft was a LOT rougher. I was just banging away on the keyboard. No f*cks given for misspelt words, comma, comma, comma, rolling fast. editing was a lot slower in those days. That first reading pass or two, was hell. moving/deleting paragraphs. Mentioning things that hadn't been "discovered" yet, etc.
I've since learned to slow down a little. Fix every spelling error I notice that little squiggly red line. Not just comma,comma, comma.
I now give a quick little read/edit to every paragraph or two, as I rough draft it. It greatly cuts down on number of editing passes required.
writing+editing time = total time to produce the rough draft.
if you increase one, you decrease the other.
Its an almost perfect inverse relationship, zero sum game.
since my last project, I started watching every paragraph or two as I write them.
when I finish a chapter? I immediately read it and do some proofing-editing, followed by a second read through.
If I get 5k of a better quality chapter that requires a lot less proofing and editing later on, I think that's better.
I will say this, though.
one writing project, is outperforming all the others by a wide margin.
and yes, it was that one that had those insane long marathon sessions.
a BEAR to edit, but...
something about banging away in the heat of the moment, striking while the iron is hot.