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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.
In a small saucepan, place prunes, water, and orange juice. Bring to boil, cover, and simmer for 30 minutes. Prunes will absorb most of the water, and the remaining water will thicken into a consistency of syrup. If there is a lot of liquid remaining, simmer, uncovered, for a few minutes until sauce reduces. Transfer hot prunes and syrup to a bowl. Pour cold milk over the prunes to cover. Eat with a spoon. HINT: This remedy should work within 24 hours and can be safely eaten as often and as long as needed.