Previewed at WWDC, launching in the fall.
Apple Extends iTunes Movie Rental Window to 48 Hours in United States
In a support document that was updated today, Apple says customers have 30 days to start watching a movie after it's been rented. Once a movie is started, there's an additional 48 hours to finish the movie and/or rewatch it.
Apple's new 48 hour rental policy will be a welcome change for customers who often rent content from iTunes. Prior to today, customers only had 24 hours after starting a movie to finish it in the U.S., but the 48 hour limit has long been available in other countries.
Rented movies can be watched across multiple devices and downloaded on a single device, so customers can rent a movie, download it, and then watch it over the course of the next 48 hours. Apple says that even with downloaded movies watched offline, the 48 hour timer remains.
With the introduction of the 4K Apple TV, Apple has made many 4K movies available to rent or purchase at the same price as High Definition content. 4K content can't be downloaded, however, and is only available for streaming.