Glad that's helping.
Just a little factoid: in an hour-long TV drama like Enterprise, Act 1 is generally going to be about the first 10 minutes, Act 2 is going to be about the next 20 minutes, and Act 3 is going to be about the last ten minutes. (Without commercials, the modern TV drama runs about 42 minutes.) So when people joke about the Red Shirt dying in the first ten minutes of the show, it's true, because that's when all the exposition stuff happens that lets us know that we're dealing with something rotten enough to kill a Red Shirt!
In terms of what JiNX said about chapters--yes, they do contain a bunch of narrative. In a TV or movie script, one page equals about a minute's worth of screen time. There isn't really any narrative because the story is going to be told with pictures--the page of the script describes what we
see, so description is required since we have to know if we're outside, if the character looks like he's about to be sick, whatever. But visuals and dialogue are what tell the story. Some films do have narrators--
Kick Ass,
Forrest Gump, and
Zombie Land come to mind off the cuff--but if you think about what's being narrated, it's information that wouldn't come out very naturally if you had two characters talking about it, so instead they've chosen to give you a visual and have the narrator explain it. And it NEVER dominates the movie, it just fills in the gaps that dialogue or visuals alone can't convey.
In literary form, though, you're much more narrative dependent, since you don't have pictures to help you tell the story. Though, there are exceptions to this--I've seen entire stories told just in dialogue. Generally, though, narrative tells us the things that can't be gleaned when characters talk to each other, in addition to helping us draw a mental picture of what's happening in the story. And again, like i screenwriting, if it doesn't reveal something about the character or push the story forward, it's superfluous and needs to be cut.
There are no hard and fast rules about how long a chapter should be. Pick up a bunch of different paperbacks and you'll see that. Sometimes chapters are only 2-4 pages long, other times they can be 25 pages, it just depends. When chaptering your own stories, I would say to just do what makes sense and best serves the story: make sure that it feels like a complete unit of action (this isn't to say that your chapters can't be cliff-hanger-y), and maybe err on the side of shorter because a lot of times fan readers drop out if it seems tedious--try to keep it 6-10 pages in Word (again these are loose) in the default font.
One other thing about screenwriting--if a beta reader or editor (or admin) has ever dinged you for "show, don't tell", or taking too long to get tot he point, I highly recommend picking up Syd Field's
Screenplay and/or
The Screenwriter's Workbook. A motion picture is the ultimate exercise in showing and not telling, and because of the time constraints of TV and film, you learn how to tell a story effectively and economically--in literature, you can go on forever and there's really no one to stop you, but because TV shows and movies are expensive to produce and people are only going to sit there for so long, with rare exceptions you
have to get the job done within a certain number of pages.
And--I'm breaking this discussion off into its own thread.
