I have been on Percocet for about a month for a torn rotator cuff and my doctor wants my urine tested for kidney function ?? I take on average 5/325 x 4/day... The pain is the worst I've ever felt... but she doesn't want me to get addicted so she is reluctant to give me more. I'm not in this for the high.. I just need something to help me through the day without crying in pain... Does anyone know how long is too long to be on Percocet ??