How Long Does iOS 14 Take to Prepare?

Why is it taking so long to prepare update iOS 14?

On the software side, the issue is usually due to a partially downloaded update file or an issue with your Internet connection. There could be other software issues as well such as a minor glitch on your current iOS version. That can prevent new updates from being installed on your phone.

How long should Iphone say preparing update?

I suggest allowing at least 30 minutes, maybe more depending on what else is happening on the network.