If you thought James Cameron’s, Titanic was a long movie, then try sitting through a film that lasts 162 hours. Cinématon, made up of 2432 silent vignettes, is an experimental film that took 33 years to compose. Although you’re unlikely to catch it at your local multiplex, it has been shown in its entirety in France and the US.
Owning the record for longest movie of all time was probably not the goal of Cinématon’s director, Gérard Courant, which is just as well given that it lost this accolade in 2011 to “Modern Times Forever,” a 240-hour movie demonstrating the effect of millennia of decay on modern architecture.
Wikipedia: List of Longest Running Films