What I like about this is the 40 page limit. He actually considers it a kind of feature, and this arbitrary limit has contributed to his works. One would think that if 40 pages comes to full, the writer would just find a way to extend it, but instead he didn't bother and shortened instead.
I believe that with screenplays there's a fairly direct correspondence between the space taken up on paper and time in the movie. So a page is generally a minute. In the article, he talks about how it "creates acts" - each act is going to be about 40 minutes. I'm not in the field at all so I'm hoping someone knowledgeable will confirm or refute this.
But of course rules are made to be broken and they're also adapting a novelistic story structure.
But now kind of curious to watch some of this writer's films and time out these 40 minute act breaks.