I tried to calculate my time without loads by adding the in-game time of each mission up, but that gave me a slower time than real-time?

Here's my math:

3:29 5:18 1:56 1:57 3:11 13:07 1:43 9:07 6:52
4:49 5:02 14:44

Sum of seconds: 375 Which is equal to 6:15

Sum of minutes: 65 Which is equal to 1:05:00

Total in game time: 1:11:15

Maybe I'm supposed to subtract the real-time loading from the total real-time?

YoshQ 2021/05/24: For times where you have control of the screen in the game, I get: :30 -> 3:22 = 2m 52s 3:31 -> 8:34 = 5m 3s 8:57 -> 10:30 = 1m 33s 10:50 -> 12:29 = 1m 39s 12:54 -> 15:41 = 2m 47s 15:57 -> 28:23 = 12m 26s 28:57 -> 30:08 = 1m 11s 30:30 -> 39:01 = 8m 31s 39:35 -> 45:55 = 6m 20s 46:30 -> 50:40 = 4m 10s 51:19 -> 56:50 = 5m 31s 57:00 -> 1:11:11 = 14m 11s = 1h 6m 14s