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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.
While adding prunes and prune juice to your diet can help with weight loss, consuming them with abandon can have the opposite effect. A serving size of six uncooked prunes (or 57 grams) has 137 calories and 21.7 grams of sugar. A one-cup serving of prune juice has about 182 calories.