Atleast for the successful serious empire builder, 50+ NP depending on
swearings and such, 40 castles, 300+ garrisoned provinces. When other
empires give over nobles as they are leaving for whatever reason, I am
willing to bet that there will be players with 100+ NP, even 200+.
That game will be Risk, a few really big stacks waiting for the right
alignment of stars and alliances to unleash devestation.
Of course, do you think that the game will hold interest and uniqueness to
run that long?