Hopefully a minor meniscus problem as I understand there is a range.
I have my meniscus shaved in 1995:
1) Also hurt it playing basketball, I was 20
2) First two days after I was hurt knee hurt, limped, going up and down stairs was quite problematic.
3) Few days later it did not hurt
4) Surgery led to leg wrapped for 1-2 weeks. Don't recall the exact
5) Thigh's diameter measured 1 inch less when the bandages came off
6) Really weird to put my foot down and feel I did not have enough strength to withstand my body weight
7) Did a bit of PT and quickly, within a week, recovered a great deal and was living a normal life
8) Don't really know how I felt playing ball as the season was over at that point
In my mind the issue around the recovery is not just how long it takes to get back to being active to play. There's a chance he could be active in a month. It's just that a month off takes a player back to pre-season levels. It is not plug and play at the same level again.