User blog comment:Unrulyruby100/Timeline for Dishonored - six days/@comment-1500935-20140110121039/@comment-16533050-20140111030729

The announcement that you refer to I've noticed before. See my comment on it here: http://dishonored.wikia.com/wiki/Calendar

Having studied the Logistics side of military movements, I think some of the actions taken by some of the characters would be longer.

I agree with Molotov's perspective that the missions themselves took but the equivalent of six days to perform... but I think there are unseen intermediary timeframes inbetween missions that are merely 'skipped' so as not to bog down the story/gameplay.

However, these are merely UNSUPPORTED THEORIES of my own.