You can’t go longer than about six pages without a story turn, otherwise the reader will get bored. Although that is a rule that people have invented in modern times about best-sellers, Jane Austen’s Pride and Prejudice, follows the same rule. In Dickens it’s the same; something happens about every four to six pages. Be careful though. If you’ve got two story turns in four pages, you are going too fast and are not drawing the full drama and emotion out of each scene.
Seems like good advice to me. To see what else Follett has to say about writing, click here.