Stomach Bug 2024 Lasting A Long Time.  — how long does gastroenteritis last? It has an incubation period of 1 to 3 days, during which no symptoms occur.

Norovirus causes diarrhoea and vomiting and is one of the most common stomach bugs in the uk. Stomach flu usually only lasts a few days, but it may last up to a week or two in severe cases.