Is this is a "Conquer the Galaxy" game, or is that just one type of game that can be played in the engine? For instance, a single campaign is to conquer the galaxy. Other campaigns might be played as the rebels freeing a system from the Empire. Or being played as the Empire putting down a rebel base, etc. The Rebellion games could take a long time to play if you allowed them to, or if you had trouble locating Luke or Vader, etc.
Go big or go home.