There's a little bit of guesswork involved here, but it's based on the fact that Shyamalan has stated that the script for Glass is around 134 pages long, a number he reached after chopping the fat off his previous draft.
It's often stated that every page of the script translates to roughly a minute of screen time, but this is a very loose conversion rate that doesn't account for a number of factors.
For starters, a film's credits aren't in the script and they take up between five and ten minutes of the runtime. Also, on the page, an action scene could read "they fight", but on film, that fight could take a handful of minutes, based on just one sentence in the script.
And then, there are all the scenes that will end up on the cutting room floor, but were originally planned to be included. Shyamalan cut an entire character from Split, so he's definitely not afraid to whip out the scissors.
On the whole, it's hard to predict a concrete final runtime based on the number of pages, but it's very safe to assume that Glass will be around two hours long.
That's short enough to make it appealing to general moviegoers, but it's also longer than both Split and Unbreakable, with the extra time likely due to the fact that Glass has a meatier story to tell.
Here's hoping for a snappy, engaging movie that doesn't waste any time or feel half-baked.
Based on everything we've heard so far, what are your thoughts on Glass? Let us know in the comments below!