iOS updates typically take 15 to 45 minutes on most devices, but the time depends on your internet speed, device storage, and whether you're updating over Wi-Fi or cellular

The actual download and installation of an iOS update happens in stages, and each one takes different amounts of time. A fast Wi-Fi connection and a device with plenty of free storage space can cut the process down to 15 minutes. Slow internet, a nearly full device, or a cellular connection can stretch it to an hour or more. The update also pauses if your device locks or loses connection, which adds to the total time.

iOS updates are large files — typically 2 to 5 gigabytes depending on the version — so the speed of your internet connection matters more than anything else. A 50 Mbps Wi-Fi connection downloads much faster than a 10 Mbps connection. If you're on cellular data, the update will be slower still, and some carriers throttle speeds during large downloads.

Key Takeaways

  • iOS updates over Wi-Fi usually take 15 to 45 minutes, but slow internet or a full device can extend this to over an hour.
  • Your device needs at least 5 to 6 gigabytes of free storage before the update begins, or it will fail partway through.
  • Keeping your device plugged in during the update prevents it from shutting down or going to sleep and restarting the process.
  • Updates downloaded overnight or during off-peak hours may complete faster because your network is less congested.

Why the timing varies so much between devices

The time an iOS update takes depends on four main factors: your internet speed, how much free storage your device has, the age of your device, and whether anything interrupts the process. A newer iPhone with a fast processor and plenty of free space will install the update faster than an older model with a nearly full drive.

Free storage space is critical. iOS needs temporary space to download the update file, verify it, and then install it. If your device has less than 5 gigabytes free, the update will fail or take much longer because the system has to work harder to manage the available space. You can check how much space you have by opening Settings, tapping General, then About — look at the "Available" number at the bottom.

Older devices like an iPhone 8 or iPhone X may take 30 to 45 minutes even with good internet, while an iPhone 14 or 15 might finish in 20 to 30 minutes. The processor speed and RAM affect how quickly the device can write the new files to storage.

The stages of an iOS update and how long each takes

An iOS update goes through distinct stages, and understanding them helps you know what's happening if the process seems stuck. The first stage is the download, which typically takes 5 to 15 minutes depending on file size and internet speed. During this time, you'll see a progress bar on your device.

After the download completes, your device verifies the file to make sure it wasn't corrupted during download. This verification stage usually takes 2 to 5 minutes. Then comes the actual installation, where your device installs the new system files. This is the longest stage and typically takes 10 to 30 minutes. During installation, your device may restart one or more times — this is normal and part of the process.

Finally, your device sets up the new iOS version and may optimize apps for the new system. This final stage takes 5 to 10 minutes. If you see a progress bar that seems to stall at 99%, don't force restart your device — let it sit for at least 10 more minutes, as the final optimization can take longer than expected.

How to speed up an iOS update

The single best way to speed up an update is to use a fast, stable Wi-Fi connection rather than cellular data. If your home Wi-Fi is slow, try updating at a location with faster internet — a library, coffee shop, or a friend's house with better service. Close other apps and stop any large downloads or streaming before you start the update.

Delete files or apps you don't need to free up storage space before updating. You can use Settings > General > iPhone Storage to see which apps take up the most space. Removing even 2 to 3 gigabytes can noticeably speed up the installation stage. Keep your device plugged into power throughout the entire process — if the battery drains below 20%, your device will pause the update.

Update during off-peak hours, typically late evening or early morning, when fewer people are using your internet connection. This can improve download speeds if your network is congested during the day. Avoid updating over a VPN, as this can slow the download significantly.

What to do if an update takes longer than expected

If an update is taking more than an hour, first check whether your device is still connected to Wi-Fi. Open Control Center and look for the Wi-Fi icon — if it's not showing, your device lost connection and the update paused. Reconnect to Wi-Fi and the update should resume.

If your device is connected but the progress bar hasn't moved in 15 minutes, try restarting your Wi-Fi router. Unplug it for 30 seconds, plug it back in, and wait for it to fully restart. Then check your device again. If the update still seems stuck, you can force restart your device, but this will cancel the update and you'll have to start over. To force restart, quickly press and release Volume Up, quickly press and release Volume Down, then press and hold the Side button until you see the Apple logo (about 10 seconds).

If the update fails repeatedly, you may need to update using a computer instead. Connect your device to a Mac or Windows PC with iTunes or Finder, and let the computer handle the download and installation. This often works when over-the-air updates keep failing.

Storage space requirements before you start

iOS updates need temporary storage space beyond the size of the update file itself. A 3-gigabyte update file might require 6 to 7 gigabytes of free space because the system needs room to download, verify, and install the files. If you don't have enough space, the update will fail with an error message saying your device doesn't have enough storage.

Check your available storage before starting. Go to Settings > General > iPhone Storage and look at the number at the top. If it shows less than 5 gigabytes available, delete apps, photos, or videos until you have at least 5 to 6 gigabytes free. You can also use iCloud Photos to move photos off your device, or delete old text message attachments by going to Settings > General > iPhone Storage and tapping the largest apps to see what's taking up space.

Frequently Asked Questions

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

No. Once the installation stage begins, your device will restart and you won't be able to use it until the update finishes. You can use your phone during the download stage, but it's best to leave it alone to avoid interruptions. Don't lock your device or put it to sleep during any stage of the update.

Why does my iPhone say the update is taking longer than usual?

This message usually means your internet connection is slow or unstable. Check that you're connected to Wi-Fi and that the signal is strong. If your Wi-Fi is weak, move closer to the router or restart it. You can also try updating at a different location with faster internet.

What happens if my device runs out of battery during an update?

If your battery drains below 20% during the download stage, the update will pause. If it drains during installation, your device may fail to complete the update and you'll need to try again. Always keep your device plugged in throughout the entire process to avoid this problem.

Is it normal for an update to restart my device multiple times?

Yes. iOS updates typically restart your device one or more times during the installation stage. Each restart is part of the normal process and doesn't mean something is wrong. Just let the update continue — don't force restart your device unless the progress bar hasn't moved in 20 minutes.

Can I update over cellular data instead of Wi-Fi?

Yes, but it will be much slower and use a lot of data. Most iOS updates are 2 to 5 gigabytes, which can quickly exceed your monthly data limit. If you must use cellular, make sure you have an unlimited plan or enough data remaining. Wi-Fi is always the better choice.