How long does it take for adderall (dextroamphetamine and racemic amphetamine) xr to leave system?

Pretty Quickly: Although it is an extended release preparation, most of a dose of Adderall (dextroamphetamine and racemic amphetamine) xr will be out of the body after 24 hours, and it should be completely out of the body within a few days. Adderall (dextroamphetamine and racemic amphetamine) is not stored in the body, so the length of time is stays in the body is purely a function of how quickly it gets metabolized.