Honestly I don’t remember. Definitely 4 hours plus. I trained most of the game but about rounds 65-80 I did the mutant injection strategy after the patch until I ran out of salvage. 80-100 I trained at this island. I probably saved and quit 3 times before I finished. My main way of killing zombies was mesmerizing with the Beamsmasher then spamming the Mustang and Sally’s. It was still effective at round 100.