I was to excited and spammed start through the individual mission times, I put them in a pastepin for comparison sake. (I remembered to show total game time though)
http://pastebin.com/PqhWnNda

1 - 1:23
2 - 1:32
3 - 2:35
4 - 2:47
5 - 2:33
6 - 2:14
7 - 5:46
8 - 2:48
9 - 3:13
10 - 6:15
11 - 4:08
12 - 4:51
13 - 7:17
14 - 1:21
15 - 1:55
16 - 3:00
17 - 1:55
18 - 1:41

Total: 57:06