I've spoken with some authors who are working on non-fiction books. I've noticed that some of them know their books intimately and can correct me if I mis-relay a section back to them that I've read. They can do this without checking the actual book and I've then verified that I was incorrect.

Others have told me that by the time they were finished a seemingly infinite number of edits, they can't bear to read their own book again and just sent it to an editor at that point and released it.

I was surprised by the latter but it does remind me of my own experience writing very long papers in college. Is this common in your own experience?

I am super happy right now.

For the past few years, I've taken on so many futile projects, dead ends, I've ripped things to shreds because I stopped liking them. Finally though, I am content with one of my creations and hit 100 pages, already reworked and refined! :)

Sorry, but I'm super happy at the moment.