Few months: Long term effects from concussion are common often taking weeks or months to resolve. In some cases symptoms can last as long as 2 years or even be perminant for severe head injury or repetitive head injury so best to avoid activities where re-injury can occur until symptoms have resolved completely.
Answered 8/26/2017
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Post concussional syndrome should last solely for 6 weeks. Lingering problems beyond this point are likely indicative of chronic traumatic brain injury which heals maximally by 18 months
Answered 10/15/2021
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