It takes about 5 business days. You do realize that as a law abiding citizen you are expected to pass your test. HR probably has the results but since you should pass and it would be shocking not to, don't expect them to drop everything, call you, and throw a huge parade for you.

You are going to give yourself a heart attack before you get to work with the cheese so chill. Now I got to go answer your question on creatine.