Well, actually it was 14 min 47.7 seconds. Did a redo of the campaign (without practicing beforehand). While I haven't played campaign in a few months, multiplayer keeps my skills honeds :).
And the stopwatch was started BEFORE I started the first mission and ENDED after I got out of the last mission. While none of the missions posed an actual challenge to me, I think that if I had prepared I could do it faster :P.
-fiss