The time to return to normal after coffee poisoning must depend on the severity of the coffee poisoning and the severity of the symptoms. If the poisoning is shallow and the symptoms are mild, such as mental irritability, hyperactivity or mild dizziness, headache, nausea or vomiting, the symptoms can usually be slowly relieved within 24 hours after the metabolism of caffeine by drinking more water or replenishing fluids. However, if the intoxication is severe and affects the function of the central nervous system, such as irritability, delirium, confusion, or even coma, shock, or central respiratory depression, it is likely that the brain function will be damaged. If this condition is treated promptly in the early stage and no sequelae occur, the symptoms will recover slowly after the metabolism of caffeine is completed in about 3-7 days. However, if there are sequelae, long-term rehabilitation must be carried out later, and the recovery time is uncertain.