with the caveat that you can't really make generalizations about a number of different tires, driving styles, road conditions, etc... , how many miles can you expect to get out of a snow tire?
and when do you know the tire is no longer is effective as a snow tire (besides ending up off the road in a snowbank)?
p.s. maybe we should have a snow tire seasonal sticky. that time of the year and I have so many questions.