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You can do the math. Fentanyl lozenges-approx. 7 hours. Duragesic takes a few hours to kick in and is supposed to last up to 72 hours (like how Oxycontin is supposed to last 12 hours) but most people find it lasts 36-60 hours. From my experience I've found fentanyl patches to last about 48-54 hours.
How long does meth stay in the body, and how long can it be detected? Plasma half-life = 12-34 hours. This means that by 12-34 hours, the concentration of meth in your blood will be reduced in half. Time to leave the body = 2-10 days. Generally, the heavier the user, the longer it will take for meth to leave the body. Effects of meth use = 8-24 hours.1. Detection in urine tests = up to 72 hours.2.