Hello SCB1021,
Congrats on your new iPhone 6s Plus! I know how much you want to finish this setup process and start using your new iPhone. Let’s make sure we have addressed a couple of steps that can help your situation.
Restoring from a backup might take a while because of the size of the backup or the speed of the Wi-Fi network. For example, iCloud can take approximately 1 to 4 hours per gigabyte during a restore process.
There are several steps you can take:
- In iOS 8 or later, check the progress of the transfer on your device under Settings > iCloud > Backup. If the restore process is underway, the iCloud Backup setting is dimmed.
- Make sure that your device is connected to the Internet with reliable Wi-Fi.
- Make sure that your device is plugged in to a power outlet.
- Check the Apple progress bar that appears while transferring a backup.
If you need help restoring your device from an iCloud backup
Thank you for using the Apple Support Communities.