[muzani]

It's like telling a joke. The ending should be unexpected and inevitable.

Cut it as short as possible. Otherwise they get too confused to anticipate endings or may already get the ending if you give too many details. People sort of want to figure it out themselves and be surprised.

If you put it in an article form, and someone can comment on it without reading the article, it's not a good story.

Inevitable means that the ending was obvious in hindsight.

Three act structure is one way of splitting it into multiple parts to keep them hooked. But you can have multiple tension points within a few minutes, Toy Story is a great example of this.