How long will Adderall XR 10mg dose take to clear your system?

Effects will wear off somewhere between 8-18 (its long because it's the XR version!) hours depending on external factors such as metabolism, weight, stomach contents, etc.

The metabolites of Adderall (what is tested for in drug tests) should be clear from the body in 2-3 days if the Adderall use has not been prolonged (i.e.: one time use).