Yeah, what Stan and John said. It'll be good therapy when you are up to the task. I suspect you'll feel up to that long before you feel like real work. On the other hand, if you need to go under the layout to wire this up, it could be a while.
I hurt my left knee in November, and my right knee in May. I haven't been under my layout in about a year. It's not like there isn't work to be done under there. I'm just getting back to the point where I can walk up and down the stairs, but getting down on the floor and more importantly getting back to my feet, is the next hurdle. I've kind of been afraid to try.