any member of the subphylum Crustacea (phylum Arthropoda), a group of invertebrate animals consisting of some 45,000 species distributed worldwide. Crabs, lobsters, shrimps, and wood lice are among the best-known crustaceans, but the group also includes an enormous variety of other forms without popular names.
It is thought that infrequent, low-dose users may test positive for Xanax within urine for up to 4 days post-ingestion. Frequent, high-dose users of the drug may test positive for Xanax after a full week post-ingestion via a urinalysis. Results from a urinalysis can be confirmed with technology such as GC/MS.
Well... As for duration of action of up to 6 hours, 6 to 12 hours is the half-life period of Xanax. That is, after this length of time, one half of the taken dose is still present in your system. After another 6 to 12 hours, a half of this half is still present, and so on.anax stays in the body 4 - 6 hours depending on the individual. The second answer was correct and off a pharamacy site! YET ANOTHER ANSWER! GENERALLY speaking, how long a drug stays in your system is more likey linked to how long does the drug works in your system.