One of the first things you learn about writing screenplays is that, by and large, one page of your script will equate to about one minute of the running time. Obviously, there's some wiggle room in there, but that ends up being a pretty general rule. So, if you have a two-hour movie, chances are strong that the script will be about 120 pages long. Take Rian Johnson's screenplay for "Glass Onion: A Knives Out Mystery." It is 134 pages long, and the film cuts to its closing credits after 131...

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