72 hours per my 3 pharmicist asked... When I worked in rehab the lab that tested for us said 7 days. Around 7-8 days. Darvocets will stay in your system anywhere from 3-7 days after last use is...
i think that depends on how long u have been taking it. I was told it has a 36 hour shelf life meaning if you take 8mgs today 24 hours later there will still be some in your system for up to 36...