How long does it take for one zanex to go out of system?

The length of time that Xanax is present in one's system depends on a few factors like age, weight, height, level of physical activity, and health status. It also depends on how long a patient has been taking the drug. If the patient has only taken one dose, it should be out of their system in five to ten days. If multiple doses have been taken it could take a week to ten days or longer. It would take a urine test for a doctor to be able to confirm that the drug had exited the patient's system.