A typical iOS update takes 15 to 30 minutes on most iPhones, but the time varies based on your device age, internet speed, and available storage

The actual read and installation happen in two phases. First, your phone downloads the update file over Wi-Fi — this usually takes 5 to 15 minutes depending on your connection speed and the update size. Then your phone installs it, which involves restarting, checking files, and explore changes. That installation phase typically takes another 10 to 20 minutes. During installation, your screen will show a progress bar and the Apple logo. Your phone will restart several times, which is normal.

If you're updating an older iPhone — anything from the iPhone 7 or earlier — expect the process to take closer to 45 minutes to an hour. Older processors work more slowly through the file checks and rewrites that updates require. A newer iPhone 14 or 15 might finish in under 20 minutes total.

Storage space matters more than most people realize. If your phone has less than 2 GB of free space, the update will either fail or take significantly longer because the phone has to shuffle files around to make room for the update files. Check your storage in Settings > General > iPhone Storage before you start.

Key Takeaways

  • Most iOS updates complete in 15 to 30 minutes on newer iPhones, but older models and slower internet connections can extend this to 45 minutes or longer.
  • The update happens in two phases — read over Wi-Fi, then installation with multiple restarts — and both are normal parts of the process.
  • Having at least 2 GB of free storage space prevents the update from stalling or failing partway through.
  • If an update takes longer than two hours or your phone gets stuck on the Apple logo, you may need to force restart and try again.

Why updates take longer than you might expect

iOS updates are not small files. A major version update (like iOS 17 to iOS 18) can be 3 to 5 GB, while minor updates are usually 500 MB to 1.5 GB. Your phone has to read this entire file, verify it hasn't been corrupted, then unpack it and rewrite system files. Each step takes time, and your phone does them sequentially, not all at once.

Wi-Fi speed is the biggest variable. If you're on a 5 GHz network close to your router, you might read a 2 GB update in 5 minutes. If you're on 2.4 GHz Wi-Fi from across the house, the same update could take 20 minutes. Cellular networks are too slow and unreliable for iOS updates — your phone will refuse to read over LTE or 5G, which is why you need Wi-Fi.

Apple's servers also matter. When a major update releases, millions of people read it simultaneously. If you update on release day, you might see slower read speeds than if you wait a few days. This is not a problem with your phone — it's just network congestion.

When an update is genuinely stuck

An update that has been on the same progress bar for more than 30 minutes, or one that restarts repeatedly without advancing, is stuck. The most common cause is a poor Wi-Fi connection that drops partway through the read. Your phone will retry, but if the connection keeps dropping, the update will fail.

Move closer to your router and try again. If you're still having trouble, restart your phone manually (press and hold the power button, then slide to power off), wait 30 seconds, and turn it back on. Then go to Settings > General > Software Update and try downloading again.

If the update fails three times, your phone may need to be restored using a computer. Connect to a Mac or Windows PC with the latest version of Finder (Mac) or iTunes (Windows), select your phone, and choose "Restore." This erases your phone but installs a fresh copy of iOS. You can restore your data from a backup afterward.

Updates that stall during installation

If your phone gets stuck on the Apple logo during the installation phase, it usually means the installation process encountered a file it couldn't read or rewrite. This is rare but happens occasionally when storage is nearly full or when a previous update didn't complete cleanly.

Force restart your phone by pressing the volume up button, then the volume down button, then pressing and holding the power button until you see "slide to power off." Let it sit for 10 seconds, then press the power button again to turn it back on. This forces the installation to restart from where it left off.

If the Apple logo appears again and doesn't progress within 5 minutes, the installation has failed. You'll need to restore using a computer as described above. Before you do, make sure you have a recent backup — go to Settings > [Your Name] > iCloud > iCloud Backup and check the date of your last backup.

How to speed up an iOS update

You cannot make the update itself faster, but you can remove obstacles. Close all apps before you start — swipe up from the bottom of the screen to see your open apps and close them. This frees up RAM and lets your phone focus entirely on the update.

Plug your phone into power. Updates use significant battery, and if your battery drops below 20 percent during installation, your phone will pause the update to charge. Plugging in prevents this interruption.

Update late at night or early morning when fewer people are downloading from Apple's servers. This won't change your read speed dramatically, but it can shave a few minutes off if you're on a shared internet connection at home or work.

Delete photos, videos, or apps you don't need to free up storage space. Go to Settings > General > iPhone Storage and look for large apps or photo libraries. Removing even 1 GB of files can prevent the slowdown that happens when your phone is nearly full.

What happens if you interrupt an update

If you force restart your phone during the read phase (before installation begins), the read will start over from the beginning. You lose the time you spent downloading, but nothing breaks. Your phone will still be on the old iOS version.

If you force restart during the installation phase (after the first restart, when you see the progress bar), the installation will resume from where it left off when you restart. You don't lose progress — your phone remembers what it was doing.

The only real risk is if you unplug your phone from power during installation and the battery dies. In that case, your phone may not boot up normally. Plug it in and let it charge for at least 30 minutes, then try turning it on. If it still won't start, you'll need to restore it using a computer.

Frequently Asked Questions

Is it normal for an iOS update to take an hour?

Yes, especially on older iPhones or with a slow internet connection. An hour is still within the normal range. If it's been more than two hours and the progress bar hasn't moved, the update is stuck and you should force restart your phone.

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

You can use your phone during the read phase, but it will slow down the read slightly because your phone is splitting its resources. It's better to leave it alone. Once installation begins, your phone will restart and you won't be able to use it anyway.

What if the update fails and says "unable to check for update"?

This usually means your Wi-Fi connection dropped or Apple's servers are temporarily overloaded. Wait 10 minutes, move closer to your router, and try again. If it keeps failing, restart your phone and try once more.

Do I have to update right away, or can I wait?

You can wait, but security updates fix vulnerabilities that hackers can exploit. Minor updates (like 17.1 to 17.2) are usually safe to delay a few days. Major version updates (like iOS 17 to iOS 18) should be installed within a week or two.

Will updating delete my photos or data?

No. An iOS update only changes the operating system files, not your photos, messages, apps, or settings. Everything stays on your phone. The only time data is erased is if you restore your phone using a computer, which you should only do if an update fails repeatedly.