How long do morphine sulphate pills stay in your system for a urine sample drug test?

I have to take drug test and it has been known to be out of my system in 72 hours(3 days). I think it just depends also on how much you've used or use daily. I was using it everyday and getting drug tested once a month but, I would clean up like 3-4 days ahead of time and piss clean every time.