I am one chapter away from finishing the copy edit of the current book from hell, but it is one long chapter -- 60 pages before the figures are dropped in. I can see the light at the end of the tunnel, but it's still a long long tunnel.
I'll feel a little weird when I finally finish, though. I started copy editing this book in late May. Finally pushing this off my plate will feel a bit like having a 50-pound tumor removed. It'll take a while before that "always-there-and-waiting" feeling fully goes away.
Of course, I'll have other books to work on. Microsoft has made sure of that.