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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.
to find your necessary dose of suboxone, u really have to let yourself start to be in withdrawl, this means being off of fentanyl about 36 hours. the doctor generally will have you come in early so he can assess you- see how bad the withdrawal is and start you on an inital dose.