In the 2 hours since receiving my iPhone SE I've tried and failed restoring from iCloud a total of 4 times. My iPhone SE has burned through 1/3 of its battery. The first time it got stuck on "Time remaining: estimating..." for 30 minutes. The second time the restore finally got rolling but just as it was almost done someone called me. When I finished the phone call the entire restoration process was reset. Then it got stuck on "estimating..." for another 15 minutes. I'm currently on my 4th attempt; so far still on "estimating..." but I'll let it do its thing for at least an hour. I don't understand why iCloud restoration has been such a pain in the neck. My iPhone 6 backup is only about 11 GB. I don't believe it's my Wi-Fi since my iPhone 6 took less than 5 minutes to back up.