Switzerland is 10 years and then you need to pass a language and general knowledge test. The contents of the test depend on the region you live. Honestly I don't see it as that ridiculous.

I heard stories that it's still nigh impossible because you need good references from your local commune, and those are really hard to get.

Note: I'm only spreading rumors :)

Well, the exact requirements depend on the canton and commune you happen to be in. If you're in a village in Appenzell Innerrhoden it's going to be more tricky than if you're in one of the more international cities like Basel, Zürich, Geneva etc.