@Finn dAbuzz,
I think it's about a decade.
Given that Canada is somewhat more socially liberal than the U.S., I suspect married gays here have a better chance of
staying married than most American couples.
At the fringe of the same subject, one of the things the Canadian government forgot to plan for when allowing same-sex marriage was same-sex divorce. An A2k'rs relative was the judge who ruled on what was thought to be the world's first same sex divorce, which forced a change in the definition of spouse in Canada.