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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 does a 5mg Ritalin stay in your system? the effect lasts about 4 hours and the drug does not leave any residue in your system. It releases instantly, taking about 15-30 mins for the effects to become apparent and thâ¦en is excreted within about 8 hours. Its noticable effects last about 3-5 hours. 24 people found this useful.