How long does one 2mg xanax (alprazolam) stay in my blood?

Drug Testing: Xanax, (alprazolam) a Benzodiazepine, is quite variable for testing. Online you will learn that testing will be positive for one week. But, some tests can pick up Benzodiazepines for up to eight weeks after you use it.

12 to 24 hours: Xanax, or alprazolam, has a relatively short "half-life," meaning that it's metabolized quickly. However, that number is still a range of anywhere from about 6 to 12 hours depending on a variety of factors, including health status, age, weight, overall health, nutritional status, liver and kidney function, other medications taken, etc. It might be detected in a blood or urine specimen for 24 hours