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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.
This window varies greatly depending on the drug test and the drug being detected. Your drug test detecÂ­tion window has two comÂ­poÂ­nents. 1  How long after you conÂ­sume the fentanyl will it begin to show for detecÂ­tion.  How long the fentanyl will be detectable in your body before you can test free.