Funny, but in my head, all my posts are short. In real life, not so much.
Time-wise, its all about the same - the only posts that take more time than the average e-mail (or two, maybe) are the coding-type posts, which are few and far between. Verbosity has never been one of my personal challenges :)
Still, I'd rather be concise - "Brevity is the soul of wit", and all that. There's some positive reinforcement that you'd think would help me: my smaller articles and posts tend to generate more comments and discussion - seems to be less interest in my more wind-bag-y dissertations.
On balance, that's probably because (a) the smaller posts get read more - "economy of motion" in action, and (b) they get misunderstood more - that is, people read what they want into them, which always makes for good fun. Or it could be because (c) my "insights" are, well, a bore :)
And that's all I have to say about that.
(Except to mention that this post title is not SEO friendly :P)