Jeff Patton has some great points about the ideal size for user stories in his book User Story Mapping.
A right-sized story from a development team’s perspective is one that takes just a few days to build and test.
That’s great for a development team, but what would the Stakeholders say?
A right-sized story from a business perspective is one that helps a business achieve a business outcome.
So is there a perfect size for stories?
The right size is the size that’s relevant to the conversation you’re having.