How long do percocet and lortab stay in your urine?

What strength and how frequently do you use either?

It is different for everyone.. it all is based on metabolism, how much you took, how often you take it, and several other things.

And its not that it stays in your urine but your bloodstream. It passes from your blood into your urine from your kidneys. So trying to alter your urine or flush something out does not work.