Windows Update timing depends on your device, internet speed, and which update you're installing

A routine Windows Update usually takes 20 minutes to an hour on a modern computer with a decent internet connection. Major updates — the kind that arrive twice a year in spring and fall — can take 2 to 4 hours, sometimes longer. The time isn't fixed because it depends on how much your system has to download, how fast your drive writes data, and whether your computer has to restart partway through.

The most important thing to know: don't force shut down your computer during an update, even if it seems stuck. Windows needs to finish writing files to your drive, and interrupting that process can damage your system badly enough that it won't start again.

Key Takeaways

  • Monthly security updates typically finish in 20 to 60 minutes, while major feature updates can take 2 to 4 hours or more.
  • Older computers, full hard drives, and slow internet connections all make updates take longer.
  • Your computer will restart one or more times during the update — this is normal and necessary.
  • Leaving your computer plugged in and undisturbed while updating prevents problems that can make your system unbootable.

Why monthly updates are usually faster than major ones

Windows releases two kinds of updates on different schedules. The monthly updates that arrive on the second Tuesday of each month (called Patch Tuesday) are smaller — they typically contain security fixes and minor improvements. These usually download and install in under an hour because they're only changing specific files rather than overhauling large parts of the system.

The major updates that arrive in spring (around April) and fall (around October) are much larger. These include new features, redesigned parts of Windows, and significant under-the-hood changes. They can require 2 to 4 hours because Windows has to replace thousands of files, check compatibility with your hardware and installed programs, and sometimes reorganize how your drive stores data.

What slows down your update

A computer with a full or nearly full hard drive will update much more slowly than one with plenty of free space. Windows needs room to download the update files, extract them, and create temporary copies while it's installing. If your drive is more than 90 percent full, the update process has to work around that constraint, which can double or triple the time.

Internet speed matters too, but less than you might think. Even on a slow 5 Mbps connection, downloading a 1 GB update takes about 27 minutes. The real bottleneck is usually your hard drive writing the files, not downloading them. Older computers with traditional spinning hard drives (not solid-state drives) are noticeably slower at this step than newer machines with SSDs.

Background programs also slow things down. If you have antivirus software, backup software, or file-syncing apps running while Windows is updating, they compete with the update process for your drive's attention. Windows tries to pause these programs during updates, but it doesn't always succeed.

What happens during the restart phases

Most updates require at least one restart, and major updates often require two or three. Each restart is part of the process — Windows can't replace certain system files while the operating system is running, so it has to shut down, make the changes, and start back up. This is normal and expected.

During a restart, you'll see a message like "Working on updates" or "Getting Windows ready" with a percentage counter. Don't turn off your computer during this phase. It can take 10 to 30 minutes depending on how much work Windows has to do. If the percentage counter seems stuck at 99 percent for more than 30 minutes, your computer may have genuinely frozen, but this is rare — most of the time it's just working slowly.

How to check update progress on your computer

On Windows 10 or 11, open Settings (press Windows key + I), then go to System and then About. You'll see "Windows Update" near the bottom. Click "Check for updates" to see the current status. If an update is already downloading or installing, you'll see a percentage and an estimate of time remaining.

That time estimate is often wrong — it tends to be optimistic. If it says 15 minutes remaining but you've been waiting 45 minutes, the update is probably still working normally. The estimate recalculates as the process moves through different phases, and some phases take longer than others.

Scheduling updates to happen when you're not using your computer

Windows 10 and 11 can install updates automatically during hours when you're not using your computer. Go to Settings, System, then About, and click "Advanced options" under Windows Update. You can set "Active hours" — the times when you're typically using your computer. Windows will avoid restarting during those hours and will install updates outside them instead.

If you have a major update pending and you know you'll need your computer tomorrow, restart it tonight and let the update run while you sleep. This is much better than having Windows force a restart in the middle of your workday. You can also manually trigger an update to start immediately by going to Settings and clicking "Install now" if one is waiting.

What to do if an update seems stuck

If you see "Working on updates" or a percentage counter that hasn't changed in 45 minutes, wait another 15 minutes before assuming something is wrong. Updates genuinely do stall at certain points, especially on older computers or full drives.

If nothing has changed after a full hour, restart your computer by holding the power button for 10 seconds until it shuts down completely. Wait 30 seconds, then turn it back on. Windows will resume the update from where it left off — it doesn't start over. If the same update fails multiple times, check that your drive has at least 10 GB of free space, close all other programs, and try again. If it keeps failing, you may need to contact Microsoft Support or visit a local computer repair shop, because repeated update failures usually point to a hardware problem.

Frequently Asked Questions

Can I use my computer while Windows is updating?

Not really. Windows will slow down dramatically and may become unresponsive. It's designed to run updates when you're not using the computer. If you interrupt it by force-shutting down or unplugging the computer, you risk making it unbootable.

Why does Windows Update restart my computer without asking?

Windows restarts automatically because it can't finish installing certain system files while the operating system is running. You can delay the restart by setting Active Hours in Settings, which tells Windows when you're using the computer and when it can restart instead.

Is it normal for an update to take 3 or 4 hours?

Yes, especially for major feature updates on older computers or computers with full hard drives. If your computer is restarting multiple times and showing "Working on updates" for long periods, that's expected behavior. Just leave it plugged in and undisturbed.

What if my computer restarts in the middle of an update?

Windows is designed to handle unexpected restarts during updates. It will resume the update process when your computer starts back up. However, unexpected restarts are rare — if your computer keeps restarting on its own during updates, it may have a hardware problem and should be checked by a technician.

Do I need to stay home while Windows updates?

No. Once the update starts, you can leave your computer alone. Just make sure it's plugged in and won't go to sleep. You don't need to be present — Windows will finish the update and restart on its own schedule.