Update April 2, 2019: So the 22-movie Marvel Studios marathon wasn't a April Fools' joke. It's real, tickets went on sale Tuesday along with tickets for Avengers: Endgame, it costs $125, and its runtime is now listed at 47 hours and 52 minutes.
The marathon will occur in 12 North American cities (including 11 in the U.S. and 1 in Canada), and according to this seating chart taken on Fandango at 4:45pm ET for the AMC Lincoln Square 13 event in New York City, tickets are going fast (blue is the seats still available).
Original story published April 1, 2019: AMC Theatres, the author of previous Marvel Cinematic Universe movie marathons including last year's 12-film marathon leading up to the release of Avengers: Infinity War, may be looking to top itself.
The major theater chain currently has a listing on its website for a full 22-film Marvel Studios Marathon "unlike any other" beginning Tuesday April 23, two days before the earliest public screenings of Avengers: Endgame at 5pm ET on Thursday April 25.
The would be every Marvel Cinematic Universe film (including Sony's Spider-Man: Homecoming) from Iron Man through Endgame.
According to their website, the event will take place at three locations - Lincoln Square 13 in New York City, River East 21 in Chicago, and Metreon 16 in San Francisco.
"Starting Tuesday, April 23, see 22 films from the Marvel Cinematic Universe all leading up to Marvel Studios' Avengers: Endgame," reads the website page. "This premium event will include, marathon only collectibles, exclusive content, and a special concession offer. Plus, Avengers: Endgame will start at 5pm local time, one hour earlier than regular public show times."
The website lists the runtime of the marathon at a whopping 59 hours and 7 minutes, which means if every film ran back-to-back without a pause to culminate in a 5pm showing of Endgame (which reportedly has a runtime of about 3 hours) it would have to begin on Tuesday at around 8am local time.
Tickets for the marathon are not yet on sale.