It Won't Take Long--The Biggest Lie

I planned to submit an older book to a publisher this week. It was one that several publishers showed interest in just before the Big Drop when everyone stopped buying everything.
Anyway, I thought I'd read through it and clear it up: move the dates up a year, freshen the clothing styles, whatever.
Ha!
I can't just skim through. I have to read, and then I find things that could be said better, things that should be clarified, things that need paring down. In other words, I'm in the middle of a full edit.
And it's going to take a while.