couple of years. I been there several times and love it. Always wanted to live there and my current job situation only requires a internet connection and an airport. Land is pretty cheap though building costs are not. Cost of living seems a bit more expensive than Utah. We will be able to afford some land and want to build in the Lolo-Florence area.
From what I've seen the church's presence is pretty good in Missoula. There are a couple of buildings in Missoula itself and one in Lolo. I think just one stake that covers all of Missoula and some surrounding area. Never lived ther so don't know what the wards are like.
Also, if you don't have a job, or lose a job, you're likely moving. Not a real good economy up,there. Not a lot of good job opps.