i had a total reconstructive surgery and i was in jeopardy of missing my senior year of soccer. So I worked really hard in PT, and my pre surgery time to strengthen all my muscles around my knee. Because the stronger you go in, the fast you come out. anyway I was out for 4.5 months, then cleared to play soccer, ski, run, anything I wanted.
Your recovery time is really honestly up to you. The harder you work at it, the faster you will be up and at it. Or you could just sit and halfass it, and think that by doing the bare minimum it will come with time. Not the case. If you really want to ski, and you're serious about it get biking, and strengthen that knee.
there's my $0.02