Question - How long can a boards post potentially be?

I've seen people troll by posting the entire script to a movie, so if there's a limit it's pretty large. Make your post, and if you somehow run into a limit you can split it into two posts which you post at the same time and provide links to the other. I also suggest writing it in any text editor first so you can save it, because if you accidentally close or back in the site while writing you'll lose it all.