common prep tasks (pre-download any updates - lion won't have many to pre download now since it's new).The problem with any prediction is that there are four parts to the install: Then you will need to research what to do if trying again doesn't sort things out for you.Įven if your install should take 15 minutes, why risk it until the pressure is off? full drives / Air with HD: 30 to 45 minutesįurthermore, you won't really know how long it will take if problems crop up moving thousands of tiny files or the process hangs.Here are some ballpark numbers people are reporting for upgrades with real life amounts of data on their macs: Since you can't easily interrupt things and won't have use of the mac once the installer logs you out to start the upgrade, do give yourself a little window in case things run long. ![]() Of course, you'll probably be spending hours exploring all the new features, so you might want to count that against your system being unusable for "real work" due to "exploration and play". It's a safe bet that most people are out of business for less than an hour.
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