2. Salted duck eggs are usually boiled in boiling water for about 8 minutes, and boiled in cold water takes 12 to 15 minutes. Cook salted duck eggs in water over medium heat. In order to prevent salted duck eggs from breaking easily, it is best to cook duck eggs in cold water. Salted duck eggs are salty. Don't eat boiled salted duck eggs immediately. You can dry the water on the surface of duck eggs or put it in salt water for preservation, and then put it in a cool place to prevent ventilation.