Symptoms normally subside after an hour, but can last several hours. If the diarrhea lasts for several days, a physicial should be contacted. Diarrhea can be serious , especially in infants and the elderly, if the lost fluids and nutriants are not replaced. | Symptoms normally subside after an hour, but can last several hours. If the diarrhea lasts for several days, a physicial should be contacted. Diarrhea can be serious , especially in infants and the elderly, if the lost fluids and nutriants are not replaced. |