I need surgery on my meniscus, probably a replacement. how long is the typical recovery time for a replacement?

It varies: If you are referring to a meniscus transplantation, the recovery can be extended over a number of months. If you are simply talking about treatment for a meniscus tear, then the recovery is usually far more rapid. If the torn piece is removed, the recovery can usually be measured in days. If the tear is repaired, the recovery generally takes approximately 3 months or slightly longer.

Replacement?: Typically, meniscus surgery involves either partial removal/trimming or repair/stitching. Partial removal has a fast recovery - usually just a few weeks, while repair takes several months to heal. Not sure what you mean by replacement as you are too young for total knee replacement. Meniscal transplant is an uncommon procedure that has a very lengthy recovery.