War Table Bug - Timed Missions

I have the same issue with the war table missions. I played it on xbox 360 too. My theory, it is caused by the xbox 360's clock. Because the missions use the real time, it relied on the xbox 360's clock. I played offline, so every time i turned off my console, the time reset back to the default setting. For example, my xbox started on 8.00 pm as the default time. I played the game for about 2 hours (10.00 pm), before started the mission that originally had about 15 minutes to finish, then turned off my console before that mission was finished. When i played again, the time reset back to 8.00 pm (same day), which means the time were 'reversed' back 2 hours. This cause the mission to add additional 2 hours (2:15:00) to finish. Anyway, i used the same solution that Crazedwyvern987 gave (thanks btw) and it worked, just so you know. Hope this helps. Sorry for the bad English.