Although a relatively mild infection, Norovirus infection can occur at any age because even if you have it once, you are not immune. The incubation period for Norovirus is anything from 24 hours to three days, and symptoms usually last 12-60 hours.The onset is sudden, and those affected often feel very nauseous and can start vomiting.lthough a relatively mild infection, Norovirus infection can occur at any age because even if you have it once, you are not immune. The incubation period for Norovirus is anything from 24 hours to three days, and symptoms usually last 12-60 hours.