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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.
I eat 6 stewed prunes everyday but it can take up to 24 hours or more for it to work. This doesn't help the stool that is already stored in the rectum from the last 3-4 days. You also have to drink lots of water like 64 oz. a day. This is what I do when I haven't had a bowel movement in 3-4 days.