I've seen a couple references to the group that told adopters to crate for 22 hours per day, and I'd just like to clarify a bit. I adopted both of my greys from that group. I am not otherwise involved with the group. Heavy crating *is* recommended ... for the first two weeks only. It is a way to ease the dog into your home life without overwhelming him or her, and it's a useful tool for new adopters, especially people with minimal dog experience. Anyway, both of mine did just fine with it and were / are great dogs.
And it's not 22 hours per day. It's use the crate as a safe place for the dog to be, even if you're home. There is no set # of hours.