How long does it take for a hershey bars caffeine to leave the system?

Caffeine typically has a half-life of about 3 to 7 hours in the human body, depending on individual factors like metabolism, age, and overall health. Since a standard Hershey's Milk Chocolate Bar contains about 9 milligrams of caffeine, it would take roughly 15 to 35 hours for the caffeine to be mostly eliminated from your system. However, noticeable effects may diminish much sooner, often within a few hours.