[thejeff]

I still suspect that very few of the AI's battles would run past 50 turns anyway. Maybe some of the very largest armies.
Even with large forces, you only tend to get the really long battles when both sides are buffed to the point of not being able to hurt each other easily, or when you've got SCs that are invulnerable to what the other side is dishing out, but can't kill fast enough. And the AI is not very good at either combining battlefield buffs or building SCs.