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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.
How long the reaction lasts depends on the type of sun allergy: 1  PMLE â The rash of PMLE usually disappears within two to three days if you avoid further sun exposure. 2  Actinic prurigo (hereditary PMLE) â In temperate climates, actinic prurigo follows a seasonal pattern that is similar to classic PMLE.