My kids have had it several times over last winter/spring and this current winter. It has lasted as little as 8 hours to as long as several days. Last May both my kids ended up in the hospital because of it. My daughter was on IV for 3 days she was so dehydrated since she couldn't keep anything down. Sorry, don't mean to scare you, it's just that you really can't tell until you are "in it". I would say the norm is usually 12- 24 hours.
Good luck. I hope your daughter feels better soon.

































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