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The film's directors, The Russo Brothers, have revealed they've test screened the three-hour movie four times already and not a single person got up for a bathroom break throughout.
The hotly-anticipated film is said to have around 20 minutes more screen-time than Avengers: Infinity War did as it's now sitting comfortably 'at the three-hour mark'.
Speaking to Collider about the screenings, Joe Russo said: "We're still at the three-hour mark. I think the studio is down with what the best story is.
"Right now, we think the movie is playing well and we've had great responses from our test audiences and we're feeling very good about where it is. We're still doing work to it. We're not done with it."
He went on to say the length was down to the quality film and the characters emotions.
Joe added: "When you have to tell a really complicated story and you want strong emotional moments with the characters, it just requires a certain amount of real estate. This one, in particular, feels like three hours' worth of real estate."
But it's got to be bloody good if not a single person moved the entire time in fear of missing out.
Anthony said: "We have screened the movie four times for audiences now. For the first three screenings, not a single person got up to go to the bathroom."
As for actual details of the film, as usual for any epic Marvel film, they're being kept tight under wraps.
But fans were privy to a new look at the film when a teaser trailer was dropped during the Super Bowl 2019.
The new Endgame reveal felt ever-so-slightly more positive than the trailer released back in December, where we saw Tony Stark adrift in space and a broken Captain America trying to come to terms with losing half his team.
In the trailer, Earth's mightiest heroes can be seen coming together - the ones who weren't wiped out at the end of previous movie Infinity War - and it looks like they're finally joining forces to fight back against Thanos.
Marvel Studios has been careful to build up the hype ahead of the concluding chapter's release later this year - and both trailers have only used footage from the first 15 minutes of a film that's going to last three hours.
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