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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.
Valium duration of action. The half-life of Valium is 20 hours, sometimes longer. It reaches peak levels in the blood just 1-1.5 hours after being taken. Despite taking several days to leave the body, the effects wear off within 4-6 hours, so it does need to be taken throughout the day. Valium time in the body. How long does diazepam stay in your system? Valium (diazepam) can stay in the body for weeks and can be detected for at least 3 weeks in urine. In some users, Valium may take 6 weeks to completely clear from the body.