What is the incubation period for stomach flu
What is the incubation period of the stomach flu (norovirus and others)? Answer: The incubation period of the stomach flu is usually about 48 hours but it can vary. It generally takes about 48 hours from the time you swallow the virus (norovirus or others) to the time when you start to feel sick1.However, it can easily be less time or more time.denovirus typically has a 1-week incubation period2. However, the incubation period can vary from person to person even when dealing with the same virus. In a recent bout of the stomach flu (viral gastroenteritis) in a friendâs household, the 5 year old got sick exactly 2 days after the 1 year old.