Estimating time remaining
take a long time for estimating time remaining
iPhone 6s Plus, iOS 12
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Thank you for posting in the Apple Support Communities. I see no one has responded to your post yet. I am happy to help!
When you get that message, the device is attempting to make space for the update. This could also mean you're having internet connectivity issues as well. If you're unable to wirelessly update, connect to a computer and update via iTunes or Finder: https://support.apple.com/en-us/HT204204