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Quick Answer. Prune juice takes different amounts of time to relieve constipation depending on the severity of the problem. Prune juice starts working within an hour and can take an hour, six hours, a week or several weeks for a lazy bowel, according to Total Health. Continue Reading.
Discard prunes after they spoil. The shelf life of prunes depends on where you store them. Make sure to know the shelf life of your prunes to avoid eating spoiled fruit. In the pantry and fridge, dried prunes will last 6 to 12 months. The freezer can extend the shelf life of a dried prune. Dried prunes stored in the freezer can last 12 to 18 months.