If you pick Belgium, The Netherlands or Britain you will lose the scenario because they cannot get the diplomatic victory, even if you conquer the German cities. There are 5 players, Germany, France, Belgium, The Netherlands, and Britain. If the French are playing and they conquer the Germans they get a diplomatic victory, in which case there is no time limit and the game can last for the rest of the war and beyond, depending on if you edit the turn length text file for this possibility. For the Germans there is a time limit and the campaign only goes to August 1940. The campaign can either be long or short. This campaign begins in May 1940 depending on which player you select.