4-6 weeks: Depending on how bad the sprain of the ligaments and muscles was initially - most sprains/ strains heal within 4-6 weeks. If it was mild then usually you feel a lot better by 2 weeks. At your (our) age, you should be careful not to return to strenuous exercise too early and let the knee heal so as not to re-injure it more seriously.
Answered 10/30/2015
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