I can't remember a time were my stomach virus was drawn out for more than 24hours. Since the posts on the thread seem to go into detail, I may as well too.

I had this bug which seemed to only last around 20 hours. The symptoms came on the night before, I didn't get any diarrhea though. The vomiting started at around 11 AM and the symptoms started at about 10PM. It was really bad, I projectile vomited at least once every two hours for the rest of the day. Around 7PM The symptoms started to fade and I didn't vomit again.