It goes 9 minutes and 35 seconds now. There are several attacks during the mission, there should be always action. Later mission will have more then 10 minutes so if 10 already is too long, I guess nobody then myself will play them 
10 mins aren't too many (cfr Seadfast, for Mobius...) if the plot is various... put some interesting events, like unexpected reinforcements, capture-ship goals, sabotages, ganimede construction rings jumping in with shivan ships inside.... oh, ok, the last maybe is too much...
Why can`t you test it? Any problems with it?
My computer has died...on this old one FS works too slowly to be enjoyable...
