Yeah I know, I had acl reconstruction myself a couple of months ago. Most people say it takes about a year to get back to playing sports for average people, athletes are more like 6-9 months. If the rehab is done properly though then there is a smaller percentage chance to re-tear it compared to your normal knee.
Meniscus injuries I don't know as much about, but I had that done at the same time as well, but from what I gathered it's the cartilage between the knee joint and prevents friction between the bones, and also prevents arthritis and stuff later on. It's like a padding, or a cushion, but when it tears, they just stitch it into place and remove the torn bits, so there isn't as much cartilage as there was before to protect the knee. If there's a doctor here they could say more about it of course but that's pretty much what I gathered. Meniscus. Repairs are like temporary fixes and there isn't as much cushion as before, acl repairs are replacing the ligament.