You probably want the "Maple Edit" of the Hobbit (also known as "J.R.R. Tolkien's The Hobbit"). It is 247 minutes and is setup as a single film with intermissions.
Trailer:
https://www.youtube.com/watch?v=85gVFD7Dqwk
Info:
http://www.maple-films.com/jrr-tolkiens-the-hobbit/the-final...