Well I was curious so after some search on google. I found something
The Story of the Vivian Girls, in What is known as the Realms of the Unreal, of the Glandeco-Angelinian War Storm, Caused by the Child Slave Rebellion
By Henry Darger
Unfortunatly it is unpublish,
15,145-page, single-spaced fantasy manuscript.
http://en.wikipedia.org/wiki/Henry_Darger
As for Publish book there this guy: Mark Leach
http://www.marienbadmylove.com/
"Marienbad My Love," the world's longest novel, is being offered for the first time in print and Kindle formats. This multi-million-word, multi-volume work has been meticulously assembled through calculation and chance from fragments of pre-existing texts both written and appropriated by Mark Leach over the course of 30 years
As of Feb. 1, 2013, "Marienbad My Love" consists of 17 volumes totaling 17.8 million words and 10,710 pages.
For now I only see vol 1 and 2 available on Kindle but it just came out on Jan 1st 2013 so I guess the rest will be Available eventualy
http://www.amazon.com/Mark-Leach/e/B...7931727&sr=8-1