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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.
On average, the oxycodone will take about 19.31 hours to clear from the system. The elimination of another ingredient, acetaminophen is shorter and the half-life usually lasts about 3.1 hours, which means that the acetaminophen will leave the system in about 17 hours. It can be shorter in some individuals where it is estimated about 11 hours where the half-life is approximately 2 hours. The full clearance of Percocet will leave the system in 24 hours which can be sometimes longer, up to 48 hours for some people.