How long does it take. For an iphone to update

Over-the-air updates depend on the internet speed, the iOS version, and the existing iOS versions. At 15 Mbps for me, it took approx 40 mins to update iOS 15.0 from iOS 15.1

iOS update through iTunes will depend again upon the internet speed, the new iOS version, and the existing iOS version and over and above the Storage of iPhone for backing up before the update.

Nontobekok Said:

"How long does it take. For an iphone to update"

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Thank you for the screenshot.

It will Vary:

Use Your Computer:

Using a computer, it will take much less time. But, with low storage free on your devices, it may dramatically increase. So, remove unneeded downloads that take GBs of space. (i.e. movies and TV Shows). Go Here: Update your iPhone Using a Computer - User Tip

Back Up First:

IMPORTANT: If you have an option to update, however, then be certain you backup your iPhone first. That way, you will have something to restore your iPhone from should anything go wrong with the update