Ios Update Estimating Time Remaining. Reset network settings by going to Settings > General > Reset > Reset Network Settings. (note that this will remove your network settings such as your Wi-Fi passwords etc). Enable Airplane Mode and wait about a minute and then disable it by going to Settings > Airplane Mode.
There are various reasons why your iPhone will stuck on "Estimating Time Remaining". To speed up the installation and make it error free, you need to make enough room. You can free up space by following the steps: There are few definite reasons that might be the possible cause for your iPadOS stuck on estimated time remaining/update request.
In terms of real fixes, all we can suggest is hanging fire and trying again in a little while.
Your iPhone may sometimes get stuck on the "Estimating time remaining" screen when you're trying to install the latest iOS version.
Enable Airplane Mode and wait about a minute and then disable it by going to Settings > Airplane Mode. Later, you can do restoration from an earlier iCloud backup before you create a new one. If the download takes a long time You need an Internet connection to update iOS.