They can't tell exactly how many pills you are comsuming... but they will see toxicity levels. If you are taking way more than the prescribed amout your test levels will be high.
If you have pain, you will feel relief. Otherwise you may feel sleepy, nauseated, or elated for a few hours. Because it is intoxicating, it can affect your ability to drive or do other things safely....
If you need to know how long or what will void Oxy from your urine....guessin you have a drug test coming up....guess the best answer for you is to get your head out of your butt and stopped doing...