WAV Editor.
Open the file up, find an area that seems like a good place to split (look for a straight line indicating no noise whatsoever, and insert a split)
This really SHOULDN'T take you that long. I've split up 5-disc sets like this, and once you've got down what/where you'd prefer to insert splits, you can chop up a song in less than 10 minutes.
I just got "Hearts In Atlantis" and am hoping it's not like that though. It's a 21-disc unabridged book
