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It depends.. If it's a really bad hit on the head then it might last up too days or weeks!!
If the injury is not that big then sometimes the concussion will only last for a couple of hours, or if your lucky seconds!!!!
If you faint you can get a really bad concussion, if the person hits there head badly but, not always.
But not only fainting cause a concussion, any time you hit your head on anything really bad, or sometimes when you are stressed.

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15y ago

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