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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.
Prunes are high in polyols, though, and may cause more harm than good in some patients (11). Summary: The effects of fiber on constipation depend on fiber type and an individualâs symptoms. Soluble fiber has shown more promise than insoluble fiber for symptom relief. Ten grams per day of psyllium fiber or 100 grams per day of prunes may be helpful for some.