Rainbow Six Siege by Ubisoft Montreal takes about 500 hours to beat the main story, or roughly 10000 hours to complete 100%.
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Inspired by the reality of counter terrorist operatives across the world, Rainbow Six Siege invites players to master the art of destruction. Intense close quarters confrontations, high lethality, tactics, team play, and explosive action are at the center of the experience. The multiplayer gameplay of Rainbow Six Siege sets a new bar for intense firefights and expert strategy in the rich legacy of past Rainbow Six games.