not long really i had a minor concussio once and it lasted for about most of the day i studdered a lot and couldn't think clearly the next day i was still a bit dizzy from the accident but was feeling back to normal by around two days after it happened but this all depends on the type of accident that occured for me, i was pushed down a steep hill and got wiplash in my neck, which caused my head to go really dizzy (so I actually didnt hit my head, but I was still diagnosed with having a minor concussion) but if your situation was different/more severe, than the healing process might take a little while longer.. but generally, it doesnt last too long
hope this helps!! (and sorry this answer was so long :))
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