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Mild to mod- 6-8 wks: Mild to moderate sprains of knee ligaments that are appropriately treated nonoperatively should generally heal in 6-8 weeks. Not all ligament sprains are the same, and actual time to healing will vary based upon severity. Most typical knee mcl sprains (grade 2-3) heal in 6-8 weeks.et help from a doctor now âº. Sprain: That depends on what is sprained and the severity of injury. Minor sprain can be a few weeks. More severe injury can be months -- or never as may need surgery to fix (acl, meniscus, etc).
How long it can take for a sprained knee to heel is dependent upon  the severity of the injury and the patients capacity to heal.It  could take anywhere from a few weeks to â¦ a couple of months for  healing to occur.he length of time for an injury to heal depends on the health of the victim and the type of injury. In general, the injury can take months to heal.