How long does it take to get your drug test results back?

I recently took a urine drug test for my probation (illinois) on friday at 2pm. theres a good chance that it will show up dilluted however i tried to avoid this by raising my creatine levels a couple days before the test. It is now wednesday and I still have not recieved any notification of failing or showing up dilluted. basically i just wanted to know how long it should take for them to contact me if i did not pass. i was told by friends that it normally takes a couple days but im not even sure if they do anything on weekends. monday was a holiday as well. any insight is greatly appreciated.

No news is usually good news...

i hear ya but any idea how long before i can really stop worrying? ive heard a wide range of answers from 2 days to 2 weeks.