https://www.cnet.com/news/avengers-endgame-tickets-are-now-on-sale-online/

"We don't have an official locked runtime yet," Russo said, But when asked about the three-hour rumors, he admitted, "Yeah, [but] we are right at about that."

Russo was more tight-lipped about some of the movie's plot issues. He wouldn't say, for example, if Captain Marvel's cat, Goose, (who's really more than a cat) survived Thanos' snap, or go into detail on return of Hawkeye (Jeremy Renner), who's been in promo clips but wasn't in Avengers: Infinity War. But he did suggest that fans who need a refresher and can't sit through all the MCU movies at least watch Infinity War and 2016's Captain America: Civil War.