Xanax typically begins to take effect within 15 to 60 minutes after ingestion. Most people feel the peak effects around one to two hours after taking it. The calming and sedative effects usually last a few hours, with noticeable effects often gone within about four to six hours, although the drug may remain in the system longer due to its half-life of roughly 11 hours. Individual factors like metabolism, weight, age, and tolerance can influence these times.