I just had my meniscus stitched back together 1 week ago. It was my 2nd surgery on the same knee, my first was about 5 years ago from which I was fully recovered. I had a separate accident to injure it the second time.
If they removed the damaged part you can usually walk out of the hospital and be mostly back to normal in 3-6 weeks.
If you have it stitched together you have no weight bearing for 3 weeks and a much longer recovery time. The benefit is the more stuff they leave in there the better.
A lot of your recovery depends on how much damage you did to the rest of your knee. I broke my knee cap and tore a bunch of cartridge, my doc told me I have a high likelihood of arthritis and will probably be a candidate for a knee replacement some day.

Rather than wishing, hoping, or praying, I would suggest good P/T and lots of hard work in the recovery. Good P/T will really suck, it hurts and is boring, but it's the only way to get strong again.