I was looking at renting a few movies for an upcoming trip (so the kids have something to watch). When I look at the restrictions on the rentals i dont think I'll be renting from itunes. You can keep a movie for up to 30 days before watching but can only watch it in a 24 hr period? That's not very convenient. If I rent a movie and the kids watch on the plane, then I can only watch it again until the next day?