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Typically, it is possible to detect methadone in the urine for 2 to 4 days after it has been used, which implies that this is the period for which methadone stays in your system. On the other hand, the detection window of methadone in blood is approximately 24 hours, while that in saliva is about 1 to 10 days.
1 The clearance half-life of methadone averages 30 hours. Urinary methadone excretion is pH dependent; excretion is decreased with increased urinary pH.  Patients who are taking methadone for therapeutic purposes excrete both parent methadone and metabolite in their urine.