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If your paragraph goes on for two pages of your document, it is too long.
Yes, editing a document with not one but THREE paragraphs exceeding a page of the manuscript and one of them is over two pages long.
Shoot for a third-of-a-page max.
Yes, authors used to do this in the past, but with e-books a solid page with no indents or paragraph returns hurts the eyes and turns off readers. If you want to publish, you write to mediums of your day: serials for newspapers, pulp fiction for pulp, and eye movement for e-books.
Use white-space for storytelling. It’s a powerful tool.
DO NOT HAVE TWO-PAGE PARAGRAPHS!!!!!
Side note: The other end of the spectrum of every.single.sentence.is.a.paragraph is equally as bad. (Ignore this article as an example, it is a RANT for crying out loud. Normal writing rules do not apply when someone is going off the hinges.)
Paragraphs are three to five sentences (in general) centered around an action or theme. This applies to both nonfiction and fiction.
As for white space is your friend, if you are unfamiliar with the thought, see “Writing Exercise: Paragraph Breaks (2/23/2016)“.
Go out. Write. Wield the Pen.
AND USE THE CARRIAGE RETURN!!!
(Off to figure out how many paragraphs this two-page monster actually should be.)