I'd say 8-10 myself, but I prefer a little elbow room.
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If you read his speech at Rice, all his arguments for going to the moon work equally well as arguments for blowing up the moon, sending cloned dinosaurs into space, or constructing a towering *****-shaped obelisk on Mars. --Randall Munroe
I will play just to have fun, but my build is one best suited for a quick strike on an opponent. This particular build was one i used in aran games where your castle was sometimes 3 squares away from another players and you could be sieging their castle on turn 3.
But Pangaea can do ok in long build up games as well. If people like elbow room i am all for it also.
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"War is an art and as such is not susceptible of explanation by fixed formula."
- General George Patton Jr.