This would be a shock if it were to be revealed correct. A 2 hour WWII Christopher Nolan movie? The last films Nolan Directed that were less than 2 hours long were Insomnia in 2002 and Memento in 2001. Every movie since then has been over 2 hours long. So while it is possible that Nolan has lost his marbles and "Dunkirk" is only 2 hours or less, I have my doubts.
[Pathe]