How long do you get to rent a movie on iTunes?

When you rent a movie on iTunes, you have 30 days to start watching it. This gives you enough time to choose a time to watch the movie that works best for you. But once you begin viewing your rental, you have 48 hours to complete watching it. During that time, you can watch it as many times as you like. Then, your rental period expires, and you'll have to decide about buying or renting the movie again.