Dishonored to be 12-14 hours long
The by now surely surgically joined co-creative directors of Dishonoured, Harvey Smith and Raphael Colantonio have spoken (in unison?), to answer that all important question: how long will the game be?
In a Bethblog Q&A Smith-tonio explained, “Play-style matters a lot”. Very direct players will probably get through the game in 12 or 14 hours. Explorers who eavesdrop a lot will take twice as long.”
They also confirmed that there will be, “six major active powers and four passive powers as well as weapons, gadgets and 40 bone charms that grant small supernatural perks”. Apparently it will be impossible to get all the charms in one playthrough.
The active powers require mana which will always reacharge just enough for basic abilities like the teleporting Blink and Dark Vison. If you want more you’ll have to use potions to refill your meter.