Most of the games I have played, I never completely finish. To me, there is no reason to continue playing once Germany is ousted from Africa and badly suffering in Europe (unless of course Japan is about to take Moscow).
In one game, the Luftwaffe (1 bomber, 5 fighters) made an attack against a BB, DD, AC, 2 FIG, and 5 TRNS. The Germans won the battle with a bomber and fighter left! With the allied shipping destroyed, the Allies had to take two more turns to rebuild their forces. In those two turns, Russia lost all but Moscow… the Allies resigned because defeat was inevitable.
I know Im not giving you every detail, but the point is, how long does it take you to realize one side is going to win?
I’d say, for over half of the games I play, it only takes 3 to 4 turns until somebody wins a decisive battle that completely tilts the board in their favor.