@jack I don't have my physical copy of "Fall" at hand, but the page numbers probably corresponds well to my impression of it. You should have pressed on because it did get a lot better again once the time of Adam and Eve had passed. The ending was genuinely good, something it seems based on other reviews isn't Stephenson's strength.
And yeah, he does drone on, and on, and on. I think "Fall" would have been just as good, probably even better, if condensed to half och 2/3 the length.
"Seveneves" is the next audio book in my queue, but I think I need something shorter before embarking on another 30+ hour journey.