Of course, you might recall that the longest underwater game of Monopoly lasted for 45 days (link). More fun facts: The longest Monopoly game in a bathtub lasted 99 hours. The longest game in a tree-house lasted 286 hours. The longest game played underground was 100 hours, and the longest one played UPSIDE-DOWN was 36 hours. Also: Fidel Castro ordered all the copies of Monopoly in Cuba to be destroyed.