A typical iPhone update takes 15 to 30 minutes on a stable Wi-Fi connection, but can stretch to an hour or more if your connection drops, your device is older, or storage space is tight

The time depends on which update you are installing. A minor update — the kind that patches security holes — usually finishes in 15 to 20 minutes. A major version jump, like moving from iOS 17 to iOS 18, can take 30 to 45 minutes. If your iPhone is an older model, storage is nearly full, or your Wi-Fi keeps cutting out, add another 15 to 30 minutes to any estimate.

The process itself has stages, and each one takes a different amount of time. Your phone downloads the update file first, then verifies it is not corrupted, then installs it to the system partition, then restarts. If any stage stalls — because Wi-Fi drops, because your phone gets too hot, because you run out of storage mid-install — the whole process can fail and restart from the beginning.

Key Takeaways

  • Minor security updates usually take 15 to 20 minutes; major version updates take 30 to 45 minutes on a stable connection.
  • Your iPhone needs at least 5 to 6 gigabytes of free storage to read and install an update, or the process will pause and ask you to free space.
  • A weak or unstable Wi-Fi connection is the most common reason updates take longer than expected or fail partway through.
  • Plugging your phone into power during the update prevents it from shutting down if the battery drains, which can corrupt the installation.
  • If an update stalls for more than an hour, force-restarting your iPhone and trying again on a different Wi-Fi network usually solves the problem.

Why read and installation take different amounts of time

The read phase depends on your Wi-Fi speed and the file size. A minor update might be 500 megabytes to 1 gigabyte; a major version can be 3 to 5 gigabytes or larger. On a typical home Wi-Fi connection (25 to 100 megabits per second), a 1-gigabyte file takes 2 to 8 minutes. A 5-gigabyte file takes 10 to 40 minutes. If your Wi-Fi is slower — under 10 megabits per second — double those times.

The installation phase is separate and does not depend on your internet speed. Your phone unpacks the update file, checks that every piece is intact, and writes it to the system storage. This takes 5 to 15 minutes on a newer iPhone (iPhone 12 and later) and 10 to 25 minutes on older models. Older phones have slower storage chips, so the write process takes longer.

After installation, your iPhone restarts. This restart is usually quick — 2 to 5 minutes — but if your phone is running low on storage or has many apps open, the restart can take longer as the system cleans up temporary files.

Storage space and why your update might pause

Your iPhone needs free space to read the update file and to unpack it during installation. Apple requires at least 5 to 6 gigabytes of free storage before the update can begin. If you have less, the update will read but then pause and show a message asking you to delete photos, videos, or apps.

This pause is not a failure — it is a safety check. If your phone runs out of storage mid-installation, the system files can become corrupted and your phone may not restart. Deleting 2 to 3 gigabytes of content (usually old videos or large apps you do not use daily) is enough to let the update continue.

You can check your storage before starting an update by opening Settings, tapping General, then iPhone Storage. The bar at the top shows how much space is used and how much is free. If free space is below 6 gigabytes, delete or back up large files first.

Wi-Fi connection problems and how they slow updates

A weak or unstable Wi-Fi connection is the single most common reason updates take much longer than expected. If your phone loses the connection during read, the update pauses. When the connection returns, the read resumes from where it left off — but if this happens repeatedly, the total time can double or triple.

Signs your Wi-Fi is the problem: the read percentage stays at the same number for more than a few minutes, or it jumps backward. If this happens, move closer to your router, or switch to a different Wi-Fi network if one is available. If you are on a mobile hotspot from another phone or device, switch to a wired Wi-Fi network instead — hotspots are less stable for large downloads.

If you have no other Wi-Fi option, you can update over a cellular connection (4G or 5G), but this is slower and uses a lot of data. On a typical 4G connection, a 3-gigabyte update takes 30 to 60 minutes. On 5G, it is faster but still slower than home Wi-Fi. Only use cellular if you have an unlimited data plan and no other choice.

Battery, heat, and why plugging in matters

Your iPhone should be plugged into power during the entire update. If the battery drains to zero during installation, the phone shuts down mid-process and the system files may not write correctly. This can leave your phone unable to restart, and you may need to restore it using a computer.

Heat is also a factor. If your phone gets too warm during the update — usually because you are using it while updating, or because the room is very hot — the system may pause the installation to let the phone cool down. This pause can last 10 to 20 minutes. To avoid this, plug your phone in, set it on a table away from direct sunlight, and do not use it while the update is running.

If your phone does overheat and the update pauses, wait 15 to 20 minutes for it to cool, then tap Resume. Do not force-restart the phone while an update is paused — wait for it to resume on its own.

What to do if an update takes longer than an hour

If the progress bar has not moved in 30 minutes, or if the update has been running for more than an hour, something has stalled. The most common causes are a dropped Wi-Fi connection, low storage space that was not caught by the initial check, or a problem with the update file itself.

First, check that Wi-Fi is still connected. Open Control Center (swipe down from the top right on newer iPhones, or up from the bottom on older ones) and look for the Wi-Fi symbol. If it is not showing, reconnect to your network and wait a few minutes for the read to resume.

If Wi-Fi is connected but the update is still stalled, force-restart your iPhone. The method depends on your model: on 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 the Apple logo appears (about 10 seconds). On iPhone 7, hold the Volume Down and Side buttons together. On iPhone 6s and earlier, hold the Home and Top (or Side) buttons together. Your phone will restart, and the update will resume from where it paused.

If the update fails again, try connecting to a different Wi-Fi network — sometimes a network has a temporary problem that prevents large downloads. If you have no other network available, wait a few hours and try again. Apple's servers sometimes experience high traffic during the first few days after a major update release, which can slow downloads for everyone.

Older iPhones and why they update more slowly

An iPhone 8 or earlier will take noticeably longer to update than an iPhone 12 or later. The difference is in storage speed. Newer iPhones use faster storage chips (NVMe), while older models use slower chips (eMMC). During installation, this difference can add 10 to 20 minutes to the total time.

If you own an iPhone 6s, 7, or 8, expect a major update to take 45 minutes to an hour. Minor updates are faster — usually 25 to 35 minutes. There is no way to speed this up; it is a hardware limitation. The best you can do is make sure you have plenty of free storage and a strong Wi-Fi connection.

Older iPhones also run out of storage more easily because they have less total capacity. An iPhone 6s with 64 gigabytes of storage may have only 10 to 15 gigabytes free after apps and photos, which leaves little room for a large update. If you own an older model, regularly delete old photos and videos, or back them up to iCloud, to keep at least 8 to 10 gigabytes free.

Frequently Asked Questions

Can I use my iPhone while it is updating?

No. Once the installation phase begins, your phone will be locked and unusable. You can use it during the read phase, but it is better not to — using the phone while downloading can slow the read and cause Wi-Fi to drop. Plug it in, set it down, and leave it alone until the update finishes.

What does it mean if the update gets stuck on the Apple logo?

The Apple logo appears during the restart phase, which normally takes 2 to 5 minutes. If it stays on the logo for more than 15 minutes, the installation may have failed. Force-restart your phone by using the button combination for your model (see the section above), then try the update again on a different Wi-Fi network.

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

You can wait, but security updates patch vulnerabilities that hackers can exploit. Minor security updates are usually safe to delay a few days. Major version updates can wait longer if you prefer, but delaying them means your phone is missing security patches. Most people update within a week of the release.

Will updating delete my photos, messages, or apps?

No. An update only changes the operating system files, not your personal data. Your photos, messages, contacts, and apps all stay exactly as they are. The only data that might be lost is if the update fails and you have to restore your phone from a backup — which is why plugging in and using a stable Wi-Fi connection matters.

Why does my iPhone say it needs to update every time I restart it?

This usually means the previous update did not install completely. Go to Settings, General, Software Update and try the update again. If it fails again, force-restart your phone and try once more. If it still fails after a second attempt, connect to a different Wi-Fi network or try updating over cellular.