How long does it usually take a swollen knee to heal ?
Depending on the injury, it can take anywhere from 20 minutes to several days for swelling to go down. Swelling itself is not the injury, it is simply a bodily reaction to an injury.
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What kind of injury is it? I have a bone bruise in my knee which causes it to swell all the time. I've had it for over 2 years now.