When I had my first shunt in 2001, which was an LP one, I was in hospital for about 5 weeks, although I'm sure for others it might have been shorter, because I think it also depends on your surgeon. It also takes time for your shunt to acclimatise to your body at first.
I had a wound on my back and my abdomen which was stapled. My back was sore for a long time and unfortunatley I was an exception to the rule because I continued to have back problems. Not everyone who has an LP shunt has back problems as it happens rarely.
On the whole though I had it for 5 years, and was symptom free, and after my recovery I went back to working fulltime just as I was before. I had it revised to a VP shunt in 2006 because of mobility problems, and for that I in for 3 days and then home. Having a shunt has made a big difference and of course it cuts out those awful lumbar punctures. Hope this helps