I'm asking so I don't go overboard, which people tell me I tend to do . . .
How long is the average story? like, the readtime?
Go Overboard. Why be average? Chances are it wont be longer than Eternal which is about 650k words.
The time to read will vary by the individual.
Edit: Just make sure the story is interesting. Otherwise, the length wont really matter.
Depends on your country. The average varies based on demographics of that population.