Four Stars (1967)

Photographed entirely in color, Four Stars was projected in its complete length of nearly 25 hours (allowing for projection overlap of the 35-minute reels) only once, at the Film-Makers' Cinematheque in New York City. The imagery in the film is dense, wearying and beautiful, but ultimately hard to decipher, for, in contrast to his earlier, and more famous film Chelsea Girls, made in 1966, Warhol insisted that two reels be screened simultaneously on top of each other on a single screen, rather than side-by-side. The film's title is a pun on the rating system used by critics to rank films, with "four stars" being the highest rating. From Wikipedia.