Monopoly only drags on for hours if you play by silly house rules like $400 for landing on Go, money for landing on Free Parking, or not requiring an auction when passing on purchasing a property. All of these common house rules artificially extend the game by either injecting cash into the game or slowing the acquisition of property.
A vanilla game of 4 player monopoly should take no more than an hour.
A vanilla game of 4 player monopoly should take no more than an hour.