How long do pain meds stay in system& is diffrent for ppl with bypass

I was giv'in a UT.For prococet& there was none in my system.I had not taken it for 3days prior to test.when it came back my dr said it should be in system for a month because for over 5 months?does anyone know if this is true?Ive checked many sites & they say it only stays in body for 8-16hrs.Also since my bypass,meds seem not to last has long.

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