The length of the wedge in a novel varies according to the genre, the author's style, and the reader group. But generally speaking, the wedge should attract the reader's attention as much as possible and provide a turning point or key plot for the story. In some systems of fiction, the wedge is usually only a few sentences or less, while in other systems it can be dozens of pages or more. Therefore, the specific length should be decided according to the overall plot of the novel and the purpose of the wedge. Generally speaking, a good story should include a key plot or introduce a new character to attract the reader's attention. Therefore, when writing a wedge, you should try your best to make the reader feel the uniqueness and importance of the wedge.