How many hour does it take to update my phone to iOS 15

Verify the checklist shown below. If you meet all the requirements, then it should only take minutes (20 - 30 or less).

Make sure that your iPhone is setup to meet the following requirements before you attempt to update the iOS version over a Wi-Fi Network. Open Settings ➡️ General ➡️ Software Update: If there is an update available for your iPhone then it will be listed here. Follow the on-screen instructions to download and update your iPhone. 

• Your iPhone must have a fast Wi-Fi connection; you cannot update over cellular data or a cellular hotspot
• The iPhone can not be in Low Power mode
• The battery state of charge must be above 50%
• Your iPhone must have at least 6GB or more free storage space
• Your iPhone cannot be connected through VPN
• You should leave the phone plugged in until it finishes updating, both to assure that it remains above 50% and to keep Wi-Fi enabled (Wi-Fi turns off when the phone sleeps if not connected to power).

Axel F.

og148 Said:

"How many hours does it take to update my phone to iOS 15"

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Use of Cellular to Update:

You can use Cellular to update, as long as you meet and have the requirements to do so. Use my User Tip: Use an iPhone 12 or later, that is using 5G, in order to update over Cellular - User Tip