A fаmily hаs recently been tо оne оf the locаl theme parks for a vacation. They stayed in a resort hotel and arrived home yesterday due to their 5-year-old becoming ill. The 5-year-old complains of vomiting and diarrhea for the past 36 hours, but states that he is feeling a bit better this morning. The parents are concerned and want to know how much longer he will be sick. What should the nurse practitioner tell these parents?