Will a quarter of a 0.5 xanax show up on a drug test after a day?

If you only took .05mg and no more than I can say with 100% that it will be out of your system in 9 days , that is if it is a urine test that you are going to take. It should have even been enough to fail a urine test the next day really. I have taken 2mg bar before(out of the blue, was not taking them at all and then took just one) and tested clean the very next day. I don't recommend trying this though. Benzos are very tricky to predict when it comes to urine test. The more consecutively they are taken the longer they will stay in your system. When I used to take xanax everyday, when I finally quit for good they remained in my system for almost a month due to the build up in my system. But you will be perfectly fine if .05mg is all you took. Be careful with benzos they are SO addictive.