Requiem duration

[ZIGS]

Ok, I'm a bit worried here. Overture was awesome and lasted 7 hours. Black Plague was EVEN more awesome and lasted 5 hours. Now, I'm all for the whole "short but sweet" thing but, like I said, I'm a bit worried.
Being Requiem an expansion (which are usually shorter than the original game), does this means it'll like 2 or 3 hours long? It might an EVEN more awesome game than BP (which I believe it'll) but seriously, anything less than 5 hours (and I'm being generous) it's just insane. Specially when the game is amazing. It's like, you're having the greatest sex with the girl of your dreams and halfway of it you're forced to stop

So, long story short, any idea on how long will Requiem be? Thanks