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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.
1 Two 8-ounce glasses of prune juice a dayâone in the morning and one at nightâusually cures constipation for adults, but if youâve been constipated for more than 3 days, youâll want to increase your dosage to 3 glasses a day. 2  Drinking a glass of water before you drink your prune juice will improve your results.ethod 3: Stewed Prunes in Lemon Juice. 1  Add 1 cup of prunes, 1 Â½ cups water, and 1 tablespoon lemon juice to a soup pot and heat them to boiling. 2  Reduce heat and simmer for 25 minutes. 3  Allow the stew to cool and eat it with a few lemon slices.