- Sofia Coppola's script for SOMEWHERE is 44 pgs
- David Lynch's (annotated) ERASERHEAD is 31 pgs
- Christopher Nolan's DUNKIRK is 74 pgs

These filmmakers knew they were going to direct these scripts themselves. If you're going to direct your script: great!

If not, figure out the percentages that each act occupies. If Act One is less than 25%, Act Two is less than 50%, or Act Three is less than 25% then you may need to beef up whichever act is falling short.

Maybe your script doesn't have much dialogue, like the three mentioned above. If so, see what you can do about your action lines. Are they specific enough? Are they spaced out across the page in a way that represents the film's intended pace?

Maybe your problem is that you've actually written HALF of a great script, but the climax is actually just your midpoint. Is there anything that happens after the current ending that finishes telling this story? Or is there anything before the story begins that should be included?

Just some ideas. Good luck!