And Titanic (1997) was 3 hours, 15 minutes, and Che (2008 film) had some road show screenings at 4 hours, 27 minutes.

But Andy Hardy Gets Spring Fever (1939) was only 80 minutes.

Road show movies, with an intermission between the two acts of the film, don't have good economics. Lord of the Rings as three movies sells more ticket than one long one, and you can offer both evening and late shows.

Well if we’re having a contest for posting long movies, Siberiade is an excellent film that will take 4h35m of your time.