Master scene headings are the primary type of slug line. They indicate a new scene is starting, letting the reader know where and when they are. If your script has 50 scenes, then it’ll have 50 ...

The three key things to signify in your slug line are: ... A typical script for a feature-length film runs 90–120 pages, or one-and-a-half to two hours. Television scripts vary by genre.

Despite all the details that the slug line should include, try to keep it as a single line of text. [Excerpt from the Scene Heading chapter of my book "Level Up Your Screenplay".] …see more ...