Oh, hell, even I can't do blind contour for an hour, and frankly I suspect that they ask for an hour so that you'll do 20 minutes.

You know that really weird feeling you get while you're doing that? That physical sensation like your brain has actually turned into some kind of thick sludge and is going gloooooooorp and sliding around inside your skull? Yeah. That's what blind contour will do to you, because you really are building new neural pathways or something -- and it's very tiring.