I wouldn't mind sitting in a screening of Dune pt1 followed by Dune pt2 when it comes out. Sounds like something Alamo would do. While not 10-14 hours, I would be willing to sit in the theater for 4-5 hours.
AMC by me did all 3 LOTR films in 3 nights just before the hobbit came out. I enjoyed it a lot but by god by the time the 3rd movie ended I was done, and then I still had to sit through another 45 minutes of endings.
(Best movies ever)