A long narrative.
A drawn - out story. This really emphasizes the length and the fact that it might seem to be taking a long time to get to the end. For example, if someone is telling a story that has lots of side - stories and digressions, it can feel very drawn - out. It's like the story is stretching out and might be testing the patience of the listener a bit.
It could be called a novel. Novels are typically long fictional prose works that tell a story.
A long tale. For example, when we talk about a very detailed and extended account of something, we can use 'tale' instead of'story' and 'long tale' to mean a long story.
Tale. For example, 'He told a long tale about his adventures.'
Another option is 'protracted story'. It implies that the story goes on for a considerable time. You might also hear 'drawn-out account' used in a similar way.
A yarn can also be another name for a story. This term is often used in a more informal or folksy way. People might say 'spin a yarn' which means to tell a story, usually one that is interesting or perhaps a little exaggerated.
Well, another word could be 'short novella'. A short novella shares similarities with a long short story in terms of length. It has more room for character development and plot complexity compared to a regular short story, yet it's not as extensive as a full - fledged novel. For example, many classic short novellas manage to tell a rich and engaging story within a relatively concise length.