Depends how you are taking it. Chewed, snorted, shot, or taking it how you are supposed to?
you can google it...oxycontin er and half life.....it would be longer than many as it is extended release
I dont think halflife is a term used for pills. Half life is a term used for things like waste amd such. I basically explains when the chemical you are using has half the property that it normally had. I think your looking for expiration. I can not help you with that.