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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.
Re: How long does Vyvanse last for you? Vyvanse always lasts 8 hours or more for me when I take 30mg and above. __________________. All changes, even the most longed for, have their melancholy; for what we leave behind us is a part of ourselves; we must die to one life before we can enter another.yvanse's effects, including the crash and the insomnia after the crash, last a really long time for me. The positive effects only last for a couple of hours, but everything combined lasts like 14 hours for me, so I try to make myself wake up really early to take it.