Your Mac is partway through a macOS update, the progress bar says "Less than a minute remaining" (or "Less than an hour remaining"), and it has sat there for ages. This is one of the most common and most nerve-wracking moments in a software update — but in the vast majority of cases the Mac is still working, not broken. Here is what the timer really means and exactly what to do, in the right order.
Why the update timer lies
The "time remaining" estimate on a macOS update is a rough guess based on how fast the last few steps ran. During the final phase — when the installer is moving files into place, rebuilding the system snapshot, and updating firmware — the work happening has almost nothing to do with the number on screen. That is why it can freeze on "Less than a minute" for 20, 30, even 45 minutes while the Mac is genuinely still busy.
The single biggest mistake people make here is forcing a shutdown too early. Interrupting a firmware or snapshot write is the one thing that can turn a slow-but-fine update into a Mac that will not boot. So the first rule is: give it real time before you touch the power button.
Step 1 — Actually wait (and how to tell it is still working)
Give the update a solid 45 minutes to an hour from the last time the screen changed. A large update on an older Mac, or one with a spinning hard drive instead of an SSD, can legitimately take that long at the "almost done" stage.
To confirm it is not truly frozen, press Command + L during the install. On many macOS versions this brings up a log window with an estimated time and a description of what step is running. If that log is moving, or the estimate is changing, leave it alone — it is working. You can also watch the Mac itself: a warm chassis, a spinning fan, or an occasional flicker of the progress bar all mean the CPU is doing something.
Step 2 — If it has been over an hour, force a restart
If the bar has not moved for well over an hour and Command + L shows nothing changing, it is time to force a restart. Hold the power button for about 10 seconds until the Mac shuts off completely, wait a few seconds, then press it once to power back on.
In most cases the Mac reboots, picks the update back up, and finishes on its own — the installer is designed to resume. Let it run again without interrupting. If it simply boots to your normal desktop, check System Settings → General → Software Update to confirm the version installed; sometimes it finished and just failed to show the login screen.
Step 3 — Reset the update if it will not resume
If the restart drops you back to a stuck installer or an error, boot into safe mode to clear whatever is jammed: shut down, then on an Apple silicon Mac hold the power button until "Loading startup options" appears, pick your drive, and hold Shift while clicking "Continue in Safe Mode." On an Intel Mac, hold Shift right after the startup chime until the login screen shows.
Once you are on the desktop, delete the half-downloaded installer so macOS grabs a clean copy: open Finder → Applications and remove any "Install macOS…" app, then re-run Software Update. A fresh download avoids a corrupted installer file that was silently causing the hang.
Step 4 — Check storage and power
Two quiet culprits stall updates near the finish line: not enough free space and a laptop running low on battery. macOS needs 15–25 GB free to stage a major update. If your drive is nearly full, the installer can crawl or stall. Free up space, then retry. And always keep a laptop plugged in for the whole update — a Mac that dips too low on battery mid-install can pause indefinitely.
Step 5 — Reinstall macOS from Recovery (last resort)
If safe mode and a fresh download still will not complete, reinstall macOS from Recovery. This repairs the system without erasing your files. Boot into Recovery (Apple silicon: hold the power button to "Loading startup options" → Options; Intel: hold Command + R at startup), choose "Reinstall macOS," and follow the prompts. It downloads a clean copy of the OS and lays it over the top, which fixes almost every stuck-update case that a restart cannot.
When a stuck update means the drive is failing
If updates repeatedly stall in the same spot, the restart hangs on a black screen or a frozen loading bar, or you hear clicking from an older Mac with a spinning hard drive, the storage itself may be failing — the installer cannot write to bad sectors. That is a hardware problem, not a software one, and no amount of reinstalling will fix it.
If your Mac is old enough that a failing drive makes a repair uneconomical, it may be time to upgrade. We sell fully-tested refurbished Macs — a MacBook Air (M1) starts at $450 and a MacBook Pro (M1 Pro, 14-inch) at $879 — and you can often knock more off by shopping our Apple clearance deals. If your current Mac still has value, we also buy broken Macs toward the cost of a replacement.
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Frequently asked questions
How long should I wait on "Less than a minute remaining"?
Give it up to an hour from the last time anything on screen changed. The final firmware and snapshot steps ignore the timer entirely, so a long pause here is normal — forcing a shutdown early is the real risk.
Is it safe to force-shut down during a macOS update?
Only as a last resort, and only after it has clearly been stuck for over an hour. Interrupting a firmware write is the one action that can leave a Mac unable to boot, so wait first and use Command + L to check the log before you decide.
Will forcing a restart erase my files?
No. A forced restart does not touch your data, and even a full "Reinstall macOS" from Recovery keeps your files — it only replaces the operating system. The only step that erases data is "Erase All Content and Settings," which you would never pick here.
The update finished but my Mac is slow now — is that normal?
Yes, for a day or two. After a major update macOS re-indexes Spotlight and re-optimizes in the background. If it is still slow after a couple of days, restart once and check Activity Monitor.