The Cure for Insomnia

The Cure for Insomnia is a 1987 experimental film directed by John Henry Timmis IV, which was, according to Guinness World Records, the longest running film. At 5,220 minutes long in length, the film has no plot, instead consisting of artist L. D. Groban reading his 4,080-page poem A Cure for Insomnia over the course of three and a half days, spliced with occasional clips from heavy metal and pornographic videos.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.