Quoting MamaCass+3:" I've had it twice, and the vomiting generally lasted 6-8 hours, the diarrhea and other symptoms usually cleared up in about 24 hours. It sucks. I hope you feel better!"`
Quoting A, E & W's mommy:" I had it with my first and it sucked but it only took about 24 hours to clear up, the worst of it lasted less than 12 hours."