how much time to install big sur
how long does it take to install mac os update Big Sur on an imac currently running High Sierra 10.13.6 with i5 3.5 ghz processor and 40GB RAM?
iMac 21.5″, macOS 10.15
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It would need to be a 2014 or later iMac that has 35.5 GB of available storage as reported by a Get Info of. your Macintosh HD drive. The time to install would depend on the Internet network hops to Apple's servers, and the health of the Internet (propagation delays) to your Mac. Internet issues aside, it will also depend on the type of storage device in your iMac, and the installed RAM. Expect a Fusion drive to be an all day sucker.
It took about 1 hour to download and upgrade a 2014 MacBook Air with 4GB RAM, and another 45 minutes to perform the migration from the mounted Mojave Time Machine backup drive. Your mileage will vary, and no one can provide you with an exact elapsed time.
