iOS updates usually take between 15 minutes and an hour on your device, but the total time depends on your internet speed, device age, and available storage

The actual installation happens in stages, and each one takes different amounts of time. Your phone first downloads the update file (which can be 1 to 6 gigabytes depending on the version), then prepares your system, then installs the changes, then verifies everything worked. If your Wi-Fi is slow or your phone is older, any of these stages can stretch out the process.

The download itself is usually the longest part. On a fast home Wi-Fi network, a typical update downloads in 10 to 20 minutes. On slower networks or public Wi-Fi, it can take 45 minutes or longer. Once the download finishes, the installation usually takes another 10 to 30 minutes while your phone restarts and applies the changes.

Key Takeaways

  • Plan for 30 minutes to an hour total when you start an iOS update, even on a fast network.
  • Your phone will restart multiple times during the update, and the screen will go dark or show the Apple logo — this is normal and you should not unplug it.
  • Slower internet, older devices, and low storage space all make updates take significantly longer.
  • Plugging your phone into power before you start prevents the update from stopping if your battery drains.

What happens during each stage of an iOS update

When you tap "Install Now" or "Download and Install," your phone first checks your internet connection and starts pulling the update file from Apple's servers. This is the download phase. Your phone shows a progress bar and a percentage. On a typical home Wi-Fi network running at 50 megabits per second or faster, this takes 10 to 20 minutes for a standard update. If your Wi-Fi is slower — many older routers or networks in apartments run at 10 to 25 megabits per second — the download can take 30 to 45 minutes.

After the download finishes, your phone moves to the preparation phase. It unpacks the update file, checks that all the pieces are there and uncorrupted, and gets your system ready for the changes. This usually takes 5 to 10 minutes and happens while your phone is still usable, though you may notice it running slowly.

The installation phase is when your phone restarts and actually applies the update. The screen goes black or shows the Apple logo and a progress bar. Your phone may restart two or three times during this phase. Do not unplug it or force it off — let it finish. This stage typically takes 10 to 20 minutes, though it can take longer on older devices like an iPhone 8 or earlier.

Why older iPhones take longer to update

An iPhone 14 or 15 can install an update in 15 to 25 minutes once the download is done. An iPhone 11 or 12 usually takes 25 to 40 minutes. An iPhone 8 or earlier can take 45 minutes to over an hour. The difference comes down to processor speed — older chips simply process the changes more slowly.

Storage space also matters more on older devices. If your phone is nearly full, the update process slows down because your phone has to shuffle files around to make room for the temporary files it needs during installation. Clearing out old photos, videos, or apps before you update can speed things up noticeably on an older device.

How to make your iOS update faster

Plug your phone into power before you start. If your battery drops below 20 percent during an update, your phone will pause the process to protect itself. On a long update, this can happen, especially if you started with low battery.

Use Wi-Fi instead of cellular data. Cellular updates are possible but much slower — what takes 15 minutes on Wi-Fi can take an hour on LTE. If you must use cellular, make sure you have a strong signal and consider waiting until you are near Wi-Fi.

Close other apps and stop using your phone while the update is downloading and installing. Background activity can slow down the process. Restart your phone before you begin the update — this clears out temporary files and gives the update process more resources to work with.

Delete large files or apps if your phone is nearly full. You need at least 1 to 2 gigabytes of free space for the update to work smoothly. If you are close to your storage limit, remove old videos, photos, or apps you do not use, then try the update again.

What to do if an update seems stuck or takes too long

If the progress bar has not moved in 30 minutes during the download phase, your internet connection may have dropped. Check that you are still connected to Wi-Fi. If the connection is unstable, move closer to your router or restart it, then try the update again.

If your phone is stuck on the Apple logo screen during installation and has not changed in 45 minutes, try a force restart. For iPhone 8 and later, quickly press and release the volume up button, quickly press and release the volume down button, then press and hold the side button until you see the Apple logo appear. Wait for your phone to finish restarting — it may take several minutes. If it gets stuck again at the same point, your phone may need to be restored using a computer and iTunes or Finder, which is a longer process.

If the update keeps failing partway through, try downloading it again on a different Wi-Fi network if you can. Sometimes a particular network has issues that prevent the full file from transferring correctly. A different network may work better.

Updates that download in the background overnight

Starting with iOS 16, Apple lets you download updates in the background overnight and install them when you plug your phone in to charge. If you see a notification that an update is ready to install, your phone has already downloaded it — the installation itself usually takes 10 to 30 minutes once you tap "Install Now."

This background download feature only works if your phone is plugged in and connected to Wi-Fi between roughly midnight and 6 a.m. If you usually charge your phone during the day or on a different network, the update will not download in the background, and you will need to download it manually when you are ready.

Frequently Asked Questions

Can I use my phone while an iOS update is downloading?

Yes, you can use your phone normally while the update downloads. However, heavy use like streaming video or playing games will slow down the download. Light use like texting or checking email is fine. Once the installation phase starts and your phone restarts, you cannot use it until the update finishes.

What if my phone dies during an update?

If your phone loses power during the download phase, it will simply resume the download when you plug it back in and turn it on. If it loses power during installation, your phone may not start up normally — you may see the Apple logo or a recovery screen. Plug it in and let it sit for a few minutes. If it does not recover on its own, you will need to restore it using a computer.

Do I have to update my iPhone right away?

No. You can delay an update for weeks or months if you want. Your phone will keep reminding you, but you can dismiss the notification. Eventually Apple stops supporting older versions, but that usually takes several months after a new version comes out.

Why is my update taking longer than an hour?

If the download is taking longer than an hour, your internet connection is very slow or unstable. If the installation is taking longer than an hour, your phone may be stuck. Try a force restart. If your phone is an older model like an iPhone 7, very long installation times are normal — these devices can take 90 minutes or more.

Can I cancel an iOS update once it starts?

During the download phase, yes — you can tap "Cancel" and stop it. During the installation phase after your phone restarts, no — you cannot cancel it. Let it finish, even if it takes a long time. Interrupting installation can damage your phone's system files.