General:
* Narratives
* Stories
* Epics
* Saggas
* Chronicles
* Legends
* Anecdotes (if they are humorous or interesting)
* Ramblings (if they are rambling and digressive)
* Yarn (informal, often used for a humorous or exaggerated story)
Formal:
* Discourses
* Treatises
* Recitals
* Narrations
Informal:
* Rants (if they are passionate and lengthy)
* Whinging (if they are complaints)
* Whales (informal, often humorous)
The best word will depend on the specific context and the type of long tales you are referring to.