St. Patrick for Banish the Snakes by GMT Games.
How long does a typical game of Amateurs to Arms take?
The 2 1/2 hours listed is a good estimate for two players who know what they're doing. Of course, new players will take longer. Also, if either or both players have analysis paralysis, it will take longer as well. There is also some variability with how things unfold in the game- if battles are particularly decisive, and if a lot of opportunities to move the Peace Track come up, things will move along more quickly.
All that said, the game was designed to be completed in one session. 2 1/2 hours is a good estimate, give or take half an hour; add an hour and a half or so for new players.