Windows updates typically take 20 minutes to 2 hours on a modern computer, but the time depends on your internet speed, which Windows version you have, and whether your system needs to restart
The actual read and installation happen in the background while you work, but the restart at the end is what most people notice. A routine monthly update might finish in 30 minutes total. A major version upgrade — like moving from Windows 10 to Windows 11 — can take 45 minutes to several hours, partly because the system needs to check compatibility and move your files around.
The time also depends on what else your computer is doing. If you are downloading files, streaming video, or running virus scans while Windows Update runs, everything slows down. Older computers with slower hard drives take longer than newer ones with solid-state drives (SSDs). A computer with 8 GB of RAM will update faster than one with 4 GB.
Key Takeaways
- Monthly security updates usually take 20 to 60 minutes from start to finish, including the restart.
- Major version updates can take 1 to 3 hours because Windows needs to check your hardware compatibility and move system files.
- Internet speed matters: a slow connection can add 30 minutes or more to the read phase alone.
- Restarting your computer before the update begins can cut total time by 10 to 15 minutes because Windows skips some cleanup steps.
- Updates run faster on computers with SSDs and at least 8 GB of RAM, and slower when other programs are running.
Why monthly updates are usually quick
Microsoft releases security patches on the second Tuesday of each month. These are small — usually 100 to 500 megabytes — and Windows can read them in the background without slowing your work much. The installation part happens while you are using your computer, and you only notice it when Windows asks you to restart.
If you restart right away, the update finishes in 10 to 20 minutes. If you delay the restart for hours or days, Windows has already done most of the work, so the final restart takes only a few minutes. The total time from "update available" to "fully installed" is usually 30 to 60 minutes if you restart promptly.
Major version updates take much longer
When Windows releases a new version — Windows 11 after Windows 10, for example — the update is much larger, often 3 to 6 gigabytes. The read alone can take 30 minutes on a fast internet connection or several hours on a slow one. After the read, Windows needs to check whether your hardware meets the requirements for the new version, which adds another 10 to 20 minutes.
The installation phase is where most of the time goes. Windows backs up your current system, installs the new version, and then restores your files and programs. This can take 45 minutes to 2 hours depending on how many files you have and how fast your drive is. The restart at the end usually takes 5 to 15 minutes as Windows finalizes everything.
Plan for 2 to 4 hours total for a major version update, and do not turn off your computer during this time. If the update is interrupted by a power loss or forced shutdown, Windows can become unstable or fail to start.
How internet speed affects update time
A fast internet connection — 100 megabits per second or faster — downloads a monthly update in 1 to 3 minutes. A slower connection — 10 to 25 megabits per second — takes 10 to 30 minutes. Very slow connections, like some rural broadband or older DSL, can take an hour or more just for the read.
For major version updates, the difference is even bigger. A 5-gigabyte update takes about 7 minutes on a 100 Mbps connection but 40 minutes on a 20 Mbps connection. If your internet is shared with other people or devices in your home, the update will be slower because bandwidth is divided among everything using the network.
You can check your internet speed by visiting speedtest.net. If your read speed is below 10 Mbps, plan for longer update times and avoid running other internet-heavy tasks — like video calls or downloads — while Windows Update is running.
What slows down updates on your computer
A computer with a traditional hard drive (HDD) takes 50 percent longer to update than one with an SSD. Hard drives read and write data much more slowly, so the installation phase drags. If your computer is 5 or more years old and still has a hard drive, expect updates to take 1.5 to 2 hours instead of 45 minutes.
RAM also matters. Windows needs free memory to read, check, and install updates. A computer with only 4 GB of RAM and many programs running will update slower than one with 8 GB or more. Close unnecessary programs — especially web browsers with many tabs open — before starting an update.
Running other tasks during the update makes everything slower. Virus scans, file backups, and large downloads all compete with Windows Update for your computer's resources. The update will still finish, but it might take twice as long. If you see the update is running, avoid starting new programs or large downloads until it is done.
How to make updates finish faster
Restart your computer before the update begins. A fresh restart clears temporary files and frees up memory, which can cut update time by 10 to 15 minutes. Close all open programs and browser tabs, then let the update run without interruption.
Schedule updates for times when you are not using your computer. If you start an update and then try to work, both the update and your work will be slower. Many people run updates overnight or during lunch breaks for this reason.
If you have a slow internet connection, connect to a faster network if possible. Some people take their laptop to a library or coffee shop with faster WiFi to run major updates. This is especially helpful for version upgrades, which can save an hour or more of read time.
Keep your hard drive or SSD from getting too full. If your drive is more than 80 percent full, Windows has less space to work with and updates take longer. Deleting old files or moving them to external storage can speed things up.
What to do if an update seems stuck
Windows updates sometimes appear frozen for 10 to 30 minutes, especially during the installation phase. The screen might show "Installing updates" with no progress bar, or a percentage that does not change for a long time. This is usually normal — the update is working, just not showing progress.
Wait at least 30 minutes before assuming something is wrong. If the screen has not changed in 45 minutes and your computer is not making any disk activity sounds, you can try restarting. Hold the power button for 10 seconds to force a shutdown, then turn the computer back on. Windows will usually resume the update or roll back to your previous version.
If the update fails and your computer will not start, you may need to use Windows recovery tools or contact a technician. This is rare, but it can happen if the power goes out during an update or if your hardware has a problem.
Frequently Asked Questions
Can I use my computer while Windows is updating?
Yes, but it will be slow. The update runs in the background and shares your computer's resources with whatever you are doing. You can check email or browse the web, but do not run heavy tasks like video editing or gaming. The update will finish faster if you let it run without other work.
What happens if I turn off my computer during an update?
Windows will try to resume the update the next time you start your computer. If the update was interrupted during installation, Windows might roll back to your previous version. Turning off your computer during an update can cause problems, so avoid it if possible. If the power goes out, Windows will usually recover on its own.
Why do some updates take longer than others?
The size of the update, your internet speed, and your computer's hardware all affect time. A small security patch takes 20 minutes; a major version update takes 2 to 4 hours. Updates also take longer if your computer is old, your drive is full, or other programs are running.
Do I have to restart my computer right away after an update?
No, but the update is not fully installed until you restart. Windows will remind you to restart, and you can delay it for hours or days. The sooner you restart, the sooner the update is complete and your computer is protected by the latest security fixes.
Is it normal for the screen to go black during an update?
Yes. During the restart phase, your screen will go black for several minutes while Windows installs the final pieces and starts up again. Do not turn off your computer during this time. The screen will come back on when the update is finished.