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All these help to flush drugs out faster. Xanax is a relatively short-acting drug when compared to Valium. If you're an average-size person, you would expect Xanax to stay in your urine for 1-4 days after last use. To be safe, you should wait at least a week. Note that this is very dependent on how much and for how long you've been taking it.
Rating Newest Oldest. Best Answer: Xanax half life: how long does Xanax stay in your system. On average, experts define the half life of Xanax at 12 hours. But Xanax half-life can be anywhere from 6-20 hours.