I'm not sure just how soon after eating they got sick. The Brazilian restaurant is in a remote part of the city. It looks like Waukegan, which is maybe an hour or two north of Chicago, depending on how one gets there. This is plausible as it's about midway between Chicago and Milwaukee. The bridal shop is in the city proper, on or near North Michigan Avenue, the Magnificent Mile. The women could easily have arrived there in the AM for a brunch and then have spent 2 or more hours at lunch, drinking, gabbing, being silly. It could easily have taken them another 2 hours to get to the bridal shop, and they might even have wandered around downtown some first. So it's very plausible that there's a 4-5 hour gap between the ingestion of the food and the onset of vomiting and diarrhea.
Is that enough for the onset of food poisoning? Yes. In college, we had an outbreak of food poisoning, 60+ people. We know where it was (in just one dorm) since all who got sick had eaten there for dinner (though not all who ate there had gotten sick), and there was no other place where all 60+ people had eaten in the previous week. I at at 6 PM and started feeling queasy at 8. I vomited for the first time at 8:45 and then again at 11. Severe diarrhea started around midnight and both continues for much of the rest of the night. The next day, many of us compared symptoms and onset times, and we were all surprised that they varied somewhat. I got sick rather earlier than most others, but I wasn't the only one who was affected within 2.75 hours.
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