How long will it take methadone to clean out of your system to pass a urine drug test?

Like many drugs the amount of time it takes before a particular drug is no longer detectable in urine depends on the quantity of drug taken "X" multiplied by the number of days of continuuous use "Y". Just to keep it simple the average person can ingest methadone ( usually by orally drinking it ) and produce a clean urine in 72 hours.