It seems reasonable the time stamp on the briefing screen is fixed as if the original briefing is an initial point in time and does not update. It also seems reasonable to me the 3D combat scenarios might be considered relatively brief enough to the designers the campaign map isn't notably affected considering it only takes a few seconds for a satellite to transition the map, and less than a minute for a navel force to travel hundreds of miles.
In my opinion, the time actually spent in combat may seem important to the statistician players, the 3D time impact on the course of the 2D campaign map seems relatively unimportant.
Conversely, the time spent in port seems to overshadow the campaign timing.
-Pv-
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