Then you stop playing the game

It somehow never occurred to Activision or Treyarch to patch the camping glitches out of TranZit, Die Rise, or Buried. As a result, I can sit in a tree in Buried, camp in the tunnel in TranZit, and sit on a hole in the wall in Die Rise until round whatever I want. Although personally, I usually decide to call it a night around round 50 when I max out my points. The cap for that is 1,000,000, if you're interested.