What is the incubation period of stomach flu virus?

There is no such thing as a "stomach flu virus". The term "stomach flu" is often used to describe a variety of gastrointestinal illnesses, but none of them are actually caused by the influenza virus. Some common causes of stomach flu include norovirus, rotavirus, and E. coli. The incubation period for these viruses can vary, but it is typically between 12 and 48 hours.