How long should an introduction be in a research paper?

There is no rule for exactly how long an introduction should be. You must consider the length of your overall paper when writing your introduction. An appropriate length for a five-page essay is about half a page, but if you are writing a 40-page paper, your introduction will span several pages and multiple paragraphs.

For More Information Please Refer: https://www.scribendi.com/advice/how_to_write_an_introduction.en.html