Yeah you don't want to blow your cover lol, when you go in keep playing the mission impossible theme tune in your head, i think the run time that's been circulating is around the 3 hour mark, but you can bet your bottom dollar the final theatrical cut will probably run between 2 hrs 25 -2hours 40 at the most, Scott is well known for be very detailed and a few of his films have run near the 2hr 30min mark. Fox will make him trim it anyway, so it can appeal to a mainstream audience, and whatever gets cut will be put back in for the dvd/blu ray release no doubt.