[@Nani], I can’t speak for everyone else, but my intro posts tend to be super long since it’s the first introduction to my character and my chance to really set the scene. I know I couldn’t keep up that length for every post, especially ones with a lot of back and forth dialogue.

In short, I wouldn’t worry too much about post length as long as you’re giving enough detail for others to work off of. Writing should be fun, not laborious.