All of these movies are 5 hours or longer. Some of the times listed are extended cuts or director's cuts. Miniseries that were not also theatrically released are not included.
Movies not in the Letterboxd Database:
Untitled #125 (Hickory) (2011) 5 Days
Happy (2013) 1 Day
Bordeaux Piece (2004) 13 Hours, 43 Minutes
The White House (2006) 11 Hours, 30 Minutes
The Wake (2000) 7 Hours, 42 Minutes
Also not included are movies that were filmed at once or together with no break, but were released in separate parts.
The Burning of the Red Lotus Temple (1928-1931) 1 Day, 3 Hours
Dream of the Red Chamber (1989) 12 Hours, 15 Minutes
Lord of the Rings (2001-2003) 11 Hours, 21 Minutes…