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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 fentanyl stays in your system. Even if fentanyl users hide their addiction, there are several ways in detecting drug use. Different drug tests can detect specific time frames. Some of the drug tests include: blood urine hair saliva; Experts utilized urine testing to detect fentanyl, the most common drug test.