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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.
The men were asked to eat 170g a day, around 15 prunes, and the women 140g, or a dozen or so, prunes. Prunes are high in fibre which means they make people feel full for a long time. The high sugar concentration in dried fruit means slimmers are usually told to limit themselves to just 30g a day. Both groups of slimmers lost around 4lb of weight and an inch off their waistlines over three months.