Marvel super-fan Agustin Alanis says he has seen Avengers: Endgame 103 times, which is both impressive and crazy. Especially when you consider that it's only been out for 45 days. Yeesh. In support of his claim, Alanis has tweeted out a picture of himself holding a ticket with a theater employee for every viewing.
Alanis revealed this feat(?) to the world via a tweet that tagged Captain America, Iron Man, and the film's directors, in addition to Marvel Studios' president and co-president. While you may recognize all those names (Chris Evans, Robert Downey Jr., the Russo brothers, Kevin Feige, and maybe Louis D'Esposito), the tweet also tagged the lesser known Anthony "Tony" Mitchell, who saw 2018's Avengers: Infinity War 103 times. Also yeesh.
As you can see, the tweet leads you to an acknowledgment from the Guinness Book of World Records of Mitchell's *tries to think of better word before giving up* acheivement. Officially his honor was for "most cinema productions attended - same film." At least until Alanis buys another ticket.
As for another record set to fall, Endgame has brought in a box office total that's now a shade north of $2.73 billion worldwide. That puts it roughly $60 million behind the current highest-grossing movie of all-time, Avatar. So Marvel need only wait for procrastinators who like empty theaters (me) or they could just give Alanis a few more weeks.