Hey ive never done pills before and dont wanna start. but ive had these 512 oxy cod pills i know it means 5mg of the good stuff or whatever rest tylenol or whatever. My question is how long do they last? i just had 2 waited 35 mins and had another one, all i broke in half and swallowed, and im feeling good. just wondering how long do they last? ive had them from a surgery awhile back and never took any for the surgery which was over a year ago.