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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.
For one thing, prunes contain plenty of dietary fiber. Since the body cannot process fiber as well as it can digest other foods, the fiber usually stays in the colon where it bonds with the existing waste. The fiber adds bulk and weight to the waste, making it easier to excrete. Aside from this, fiber also helps the waste absorb water which gives it a slippery texture.