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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.
However, it only takes 10 to 15 minutes for the urushiol to penetrate the skin and bond with cell membranes. Some people experience symptoms after as little as 30 minutes. Others may not have symptoms until 14 days following exposure. In typical cases, the reaction is most severe five days after the exposure. Mild cases of poison oak last from five to 12 days. Severe cases may last up to three weeks or longer. The rash often appears streaked and may develop into oozing blisters.