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Here’s How Long the iOS 13.5.1 Update Takes



The iOS 13.5.1 update is a small point upgrade, but it could take quite a bit of time to install on your iPhone.

Apple’s latest iOS 13 update brings a very short list of changes to the iPhone. The update doesn’t include any new features or known bug fixes.

If you’re moving your iPhone from iOS 13.5 to iOS 13.5.1, you get the shortest list of changes and the smallest download size. The iOS 13.5.1 update is in and around 77 MB for users currently running iOS 13.5.

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If you are upgrading from an older version of iOS, your iOS 13.5.1 download could be much larger because the features from any updates you skipped are baked in.

While some of you might want to hold off on downloading iOS 13.5.1 right now, most people should install the update right now or in the near future.

If you decide to install iOS 13.5.1 on your iPhone, you’ll want to set aside some time to get the upgrade properly installed on your device.

Moving your device from one version of iOS to another can cause problems so you’ll want to monitor the download and installation.

We can’t tell you exactly how long your iOS 13.5.1 installation will take because it will vary from person-to-person, device-to-device.

That said, we can help you approximate how much time you should set aside should you choose to install the new operating system.

If you’ve prepared yourself and your device for the move and you’re on a fast Wi-Fi connection, it could take less than 15 minutes to complete.

Sync (Optional)5 - 45 Minutes
Backup and Transfer (Optional)1 - 30 Minutes
iOS 13.5.1 Download3 - 20 Minutes
iOS 13.5.1 Installation7 - 15 Minutes
Total iOS 13.5.1 Update Time10 Minutes - 1 Hour+


Before you start the iOS 13.5.1 download make sure you’re prepared.

If you don’t know how to properly prepare, have a look at our pre-installation guide. It’ll walk you through the most important steps to take before you hit download.

You should be able to get through these steps in 30 minutes or less, but it all depends on your skill level and the current state of your phone.

If you haven’t backed up your data in awhile or you if you aren’t familiar with iOS 13.5.1, the pre-installation process could take you a longer.

You don’t need to follow every single step in the guide, but at the very least you’ll want to make sure your data is backed up. Data loss issues are pretty rare, but if you store sensitive data (photos, videos, etc) on your device, it’s better to be safe than sorry.

iOS 13.5.1 Download

Once you’ve handled that, it’s time to start the download process.

Again, the exact size of your iOS 13.5.1 download will depend on your device and the version of iOS it’s currently running.

If you’re on a newer version of iOS, say iOS 13.4.1, your download could be around 300 MB. However, if you’re running an older version, your iOS 13.5.1 download could be even bigger. In some cases, much bigger.

If you’re on a fast Wi-Fi network, the download could finish up in three minutes or so. If your connection is slower, you’re looking at 10 minutes or more.

iOS 13.5.1 Installation

Once your device is done pulling iOS 13.5.1 from Apple’s servers, the installation process will begin. This could take longer than the download.

If you’re moving up from iOS 13.5, your installation should take around seven or eight minutes to complete. It took around seven minutes to install on an iPhone X that we moved from iOS 13.5.

If you’re moving from an older version it could take closer to 10 minutes. iPhone users moving from iOS 12 to iOS 13 will see the longest installation time.

Your device might reboot itself a couple of times during the installation process but this is perfectly normal. Your device should boot up normally once the process completes.


After the installation finishes up, you might need to spend time logging into your iCloud account, signing into your device’s various apps and services, and/or setting up Apple Pay.

You also might want to spend some time checking your important data (photos, music, etc) to make sure it carried over properly from iOS 12, iOS 13.0, iOS 13.1, iOS 13.1.1, iOS 13.1.2, iOS 13.1.3, iOS 13.2, iOS 13.2.2, iOS 13.2.3, iOS 13.3, iOS 13.3.1, iOS 13.4, iOS 13.4.1, or iOS 13.5.

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After you do that, you should test your core applications and services to ensure they’re working normally. iOS updates sometimes cause apps to go haywire.

If you notice an issue with one of your applications, try downloading the latest version. Developers are currently rolling out iOS 13 support updates and they could help stabilize the app’s performance.

You’ll also want to poke around for bugs and performance issues. If you notice something take a look at our list of fixes for common iOS 13 problems.

4 Reasons Not to Install iOS 13.5.1 & 11 Reasons You Should

Install iOS 13.5.1 for Better Security

Install iOS 13.5.1 for Better Security

If security is important to you, think about installing the iOS 13.5.1 update.

iOS 13.5.1 brings one security to iOS 13-powered iPhone models which you can read about on Apple's website. The patch is for an exploit used by jailbreak developers. 

If you skipped iOS 13.5, iOS 13.5.1 brings iOS 13.5's 41 new security patches with it. Apple's posted the details on its website and you can dig into the particulars if you're interested. 

Among them, patches for the company's Mail app, Wi-Fi, AirDrop, Bluetooth, FaceTime, Messages, and Notifications.  

If you skipped the iOS 13.4 update, you'll get iOS 13.4's 28 security patches with your upgrade. You can read about all of them on Apple's website right here

iOS 13.4 also brought several improvements to Apple's Intelligent Tracking Prevention. Apple's John Wilander outlined them in a blog post and it's worth checking out. 

Reports have outlined a vulnerability in Wi-Fi chips made by Broadcom and Cypress Semiconductor that left billions of devices susceptible to attack.

Dubbed Kr00k, the vulnerability allows nearby attackers to decrypt sensitive information that's relayed over-the-air. 

Fortunately, it looks like the issue was patched up with the release of iOS 13.2, an update that arrived all the way back in October. 

So if you're running a really old version of iOS 13, you'll really want to move your device up to the newest version of iOS 13. 

If you skipped iOS 13.3.1, you get its patches with iOS 13.5.1.

The iOS 13.3.1 update included 21 new security patches that will help protect your device from harm. The company's outlined those patches in detail if you want to dig in. 

If you skipped iOS 13.3, you get its patches with iOS 13.5.1. iOS 13.3 brought 12 new security patches to the iPhone and you can read about each one over on Apple's security page

The iOS 13.3 update also added support for NFC, USB, and Lightning FIDO2-compliant security keys in the Safari browser. 

If you missed iOS 13.2, it had 16 new security patches on board. You can read about all of them on Apple's website right here

iOS 13.1.1 brought a security patch for a third-party keyboard issue to your iPhone. If you're interested in the particulars, you can read about them over on Apple's website.

If you passed on installing iOS 13.1, you get an additional patch with your iOS 13.5.1 update. You can learn more right here

If you're moving up from iOS 12, you'll get iOS 13.0's nine security patches with your upgrade to iOS 13.5.1. Read about those here.  

If you skipped iOS 12.4.1 or any older versions of iOS 12, you'll get their security patches with your iOS 13.5.1 update. 

iOS 12.4.1 only had one patch on board, but Apple's iOS 12.4 update brought 19 security patches to the iPhone. If you're interested in the specifics, you can read about them on right here.

In addition to those patches, iOS 13 itself comes with some security and privacy upgrades including improved anti-tracking features in Safari and the ability to get rid of location metadata in your photos.

You also now have the ability to block apps from using Bluetooth and the ability to allow apps to access your location just once.

iOS 13 will also send you reminders about applications that track your data. 

Last update on 2020-07-05. This post may contain affiliate links. Click here to read our disclosure policy for more details. Images via Amazon API



  1. issavib3

    09/19/2019 at 3:02 pm

    I’ve been at it for 2.5 hours and that’s coming from 12.4.1!!! Ughhhh!

    • Evral Tatum Mcfield

      09/20/2019 at 10:35 am

      You right about that, doesn’t matter how fast your internet provider, this download and installation its taking more than 2 hours to complete!!

  2. Dee

    09/21/2019 at 11:33 am

    I received a brand new iPhone X yesterday from Apple under my AppleCare plan. Obviously needed to upgrade it to iOS 13 from what it was currently running, which I don’t recall now. It has been sitting with a white background and black apple icon for over 12, yes I said twelve, hours. The black line going across to show download progress was slowly trekking across underneath the apple icon all night and now day. I think there might be a minuscule amount of the download line that has not completed. My eyes are not that good to say for absolute certainty. It has been plugged in the entire time and on a fast WiFi. I will be 100% honest here, I did think maybe it was stuck and so attempted to restart and try again tonight so I could at least have access to my phone during the day, but it would not turn off. Should I let it continue in this state? Is it still actually downloading? And if I am to force a restart, what is the best way to do it? All of my backups are in the cloud, not on my Mac in iTunes.

  3. Cicely

    09/21/2019 at 1:39 pm

    Mine says 21 hours. Canceling now. That’s ridiculous

  4. Eva

    09/21/2019 at 5:30 pm

    My phone is taking forever what can I do to do it much more faster :(

  5. Nina

    09/23/2019 at 9:42 am

    I was on 12.4.1 and it’s been 5+ hours so far. The progress bar has been at the end for about 90% of the time. no end in sight. Ugh.

  6. Burt

    09/26/2019 at 2:51 am

    I’m going from 12.4.1 on my iPad to 13.1. It started off saying “8 hours” but now says “1 day”.

  7. Wesley

    09/27/2019 at 4:08 pm

    Upgrading from iOS 13 too 13.1.1…over an hour so far. Right now its on the Apple icon with the spinning circle. Hopefully it will be installed soon!

  8. KellyC

    09/29/2019 at 9:15 pm

    Download took under an hour. Going from 12.4 to 14.1.1 on new iPad 11inch. Verifying update is at 1:20 mins and still counting. Can’t Apple figure out how to do an upgrade time estimate before you start the install?

    • KellyC

      09/29/2019 at 9:18 pm

      And why doesn’t autocorrect not recognize IOS versions and fix them? It tries to fix everything else! Meant 13.1.1 above obviously.

  9. Nikheel

    10/01/2019 at 2:03 am

    Mine says 2 days…

  10. William Gale

    10/02/2019 at 10:58 am

    I’m scared to mess with it …my 12.4.1 is working fine and my “auto log in” on “keychain” is working great. ….hate to think of all I might have to do to get back to normal ……. I’m going to wait a while …. all those fancy features I would likely never use … I’ve never used a split screen or all this “drag and drop” stuff.
    I would like (I think) to be able to use a device to upload and download photos but it seems like it only puts them in the “files” app although I imagine it wouldn’t be hard to transfer them …lots of questions here for me.
    I do have the SD card adapter to load photos from my camera but it won’t accept photos from an SD card from my laptop … not sure ipadios 13 will let me do that either ???

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