What is the #1 longest movie?

The longest movie ever made is "Ambiancé" by Swedish director Anders Weberg. It has an astounding runtime of 720 hours (30 days), making it the longest film in history.

"Ambiancé" is an experimental art film that spans a full month, and the idea behind it was to create a deeply immersive experience, challenging traditional notions of storytelling in cinema. The movie is primarily intended as an avant-garde work and is a far cry from conventional narrative films.

It was scheduled to premiere in 2020, but as part of the film's concept, Anders Weberg announced that he would destroy the film after its one-time screening, making it a unique and ephemeral experience. So, while "Ambiancé" holds the record for the longest movie, it is also an art project meant to explore time, memory, and the boundaries of cinema.

However, if you're looking for a more traditional film with an extraordinary runtime, "The Cure for Insomnia" (1987) holds a notable place. It has a runtime of 87 hours (3 days and 15 hours), and it’s known for being one of the longest feature films ever released. It consists mostly of an individual reading a poem, which is why it’s more of an experimental film than a typical narrative.

For mainstream movies, one of the longest is "The Lord of the Rings: The Return of the King" (2003), which has a runtime of 263 minutes (4 hours and 23 minutes) for its extended edition, making it one of the longest films in a blockbuster franchise.

So, while "Ambiancé" holds the record for the absolute longest film, there are other contenders for the longest feature films in various genres and styles.