Does it take 40 days to survive in the wild?

Live in the wilderness for 40 days. Wilderness Survival 40 is a reality show on Discovery Channel. In each episode, bear grylls, a survival expert who once served in the Secret Service, was parachuted into an uninhabited place with harsh environment and even fatal danger, such as rain forests, deserts, hills and ice fields. With only a few simple tools, his whole escape process was recorded by a photography team.