Board Thread:Lore Discussion/@comment-24346303-20140327061204/@comment-29461586-20140327061546

In my experience, one of the longest book based in a series is The Real Barenziah.

In a single book, the longest one that I know of is "The Book of the Dragonborn".

(Also, you do not need to create a new thread for people to notice your last thread. ;) )