How many hours did the longest recorded Monopoly game last?

How to get close to this number

Records of this kind are usually bounded by human endurance rather than by the activity, so the question becomes: how long can a group of people sustain a relay of playing? Marathon record attempts across many different activities cluster in the range of weeks rather than days or months, because that is where organised shifts, sleep and sponsorship interest all run out at once.

The trap is reasoning from how long your own games last. A normal Monopoly game ends when someone gives up, and a record attempt is specifically designed not to end — the players are not trying to win, they are trying to continue. Endurance records almost never measure an intensified version of the ordinary activity; they measure a different activity that happens to use the same equipment.

The irony in the explanation is worth sitting with, because it is the most interesting fact attached to this game. It was created to demonstrate how concentrated land ownership impoverishes tenants, and it was rebuilt and sold as a celebration of exactly that. A seventy-day game is an unusually literal demonstration of the original point.