Das Boot hits 5 hours in it's longest form, although the most common version only runs about 3 1/2. Lawrence of Arabia is the same area, runs just shy of 3 hours 40 minutes if you include the intermission., closer to 3 1/2 with out. Dr Mabuse, der Spieler runs for 4 1/2, but is split into two parts. I think Seven Samurai is almost 3 1/2, too.
Honestly though, unless something is hitting 4+ it's probably not worth mentioning, since I don't think that's an unreasonable time for a film to run, provided it's got enough going on to warrant it. The problem is when you get films like Peter Jackson's King Kong remake, which is over 3 hours long in the theatrical cut, and even longer in the Director's version, which is preposterous length of time when your film is about a giant ape punching dinosaurs.
At 11/29/12 03:48 PM, ZJ wrote:
2001: A Space Odyssey is the very definition of a long-ass movie. It takes forever to get through.
2001 barley tops two hours.