I've only seen Gurren Lagaan, but it's pretty short at 27 episodes, including a re-cap episode of the 'series', I think. But I don't know how long the other series are. It's the only one I've seen from the list, admittedly, and it's short, but epic. Some of the dialog is pretty cheesy, but I think it's pretty self-aware of that. If you're looking for a 'quick' anime you can finish in a weekend, this will do the trick. Or save it if you know another anime from the list is much longer and more epic and could make you forget about Gurren Lagaan after you've completed it.