Try verifying the Time Machine backup from another computer (alt-click the time machine icon in the menu bar). If you get no prediction at all within an hour or so, I would guess that something else is wrong. My last restore predicted about 20 hours (for about 300GB to restore to a standard hard disk), and I was surprised when it later changed its mind and predicted completion in a couple of hours. The recovery mode process will take a long time to read all the data which it will try to restore, and this can make predictions about duration which are wildly inaccurate. If it is on a network (Time Capsule) then connecting by Ethernet cable is better than connecting via WiFi). If your Time Machine disk is connected by USB then its limited by your USB speed (USB3 or USB2). I Hope it has completed its restore for you by now.Ī restore will take different amounts of time depending on your machine: the amount of data backed up (everything covered by your usual time machine backup), the speed of your connection to your Time Machine disk, and the speed of your iMac's internal disk.
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