My attention span is a lot loser than that!... This is not the greatest place for a dissertation... Ya start out with discussion of a topic... Establish a reputation, as to how you respond, take criticism, provide backup, further discussion, etc... Then you may...may find folks will reas as post of a few hundred words....
Digestible chunks. A truly disgusting phrase, but a requirement never the less. Very, very few would consider taking the time to read a 10,000+ word post from any of us, much less a newcomer!
10,000 characters, not words. But still, I agree with this sentiment and what wil mentioned. Smaller posts to engage and get the dialogue flowing and then, maybe, more lengthy posts.