Hearing back to take a drug test.?

I had a job interview on June 21st. Signed the papers to do the drug test, the person who schedules the drug test was out of town. That person arrived on 24th or 25th late that night. Anyways this person is from another state so I can't contact them. The person who interview me said that he would email me the information about the drug test and when to take it. But I still have not been email about the drug test. How long does it take to hear back.