He was conducting an Instagram live on Thurday to promote his new bar in Los Angeles when he revealed that the film now sits at three hours.
Russo also revealed that, though they're only halfway through the editing process, the current runtime for the film is about three hours.
Of course, the Avengers 4 runtime being cut from 180 minutes to something slightly less chunky wouldn't be the first case of movies stripping away a lot of the fatty stuff before we finally see it on theatre screens.
A follow-up question was then asked about where the now untitled Avengers 4 was in terms of post-production, in which Russo said "we're about halfway through the editing process".
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"We're really just scratching the surface on our VFX shots. We've just started work with Alan Silvestri on the score, and we're still editing picture at this point", Joe added.
One of the Russo brothers spilled a major fact about the much-awaited sequel to "Avengers: Infinity War": it may be three hours long. We like it to play at a certain pace. Uh... I'm sure that we'll squeeze it...
The studios have still not revealed the title, any poster or even production stills from Avengers 4. "I do think it will be longer than Avengers 3", he had said. In the live video, Joe said that the trailer "may or may not" arrive before the "calendar turns to 2019". Looks like we do have a long wait ahead of us. "100 per cent. The highest of any of the films to date, without question".
We are counting down the days to the release of Avengers 4 - which, by the way, is handily done for us by the good folks at Marvel and their new clock.