The limit is a guide line and is set to sustain the species. The hunting or time afield is for pleasure...good friends and a good dog. When both dog and hunter have had enough exercise and hunting pleasure it is time to quit for the day and plan another. The end of a hunting day can be by a limit of game or just the end of a pleasant day afield. There will always be another day and hunting within the limits on game may leave another bird to flush on another day.
Best,
Ron