I agree, I think it differes for each dog.

Bon is 9 months old and I still crate him when I leave. Now there has been a couple occassions when we left him for 15-20 minutes alone but that's it.
He has free roam of the house when he's in and free roam all night long so I don't "think" he would tear anything up, but he's such a big guy and I don't fully trust him yet. I'd hate to come home and have my couch or chair destroyed