According to the medical site I read, it says "sometimes is take 6 hours or more". I never throw up, never get the flu, had severe stomach aches, and all shortly after eating fast food. There are all sorts of reaction to food poisoning. The things I ate were things I commonly eat all the time anyway - tacos and a grilled chicken sandwich. I am certain that those common things I have eaten for years didn't suddenly disagree with me.food poisoning doesn't hit you in 15 minutes. It takes 6-12 hours for true food poisoning to proliferate in your body before the endotoxins cause illness. What you had a was a tummy ache not food poisoning.