Left this one for 2 hours as well, but it just won't finish.
Unfortunately, it just stops at the same moment, with 14 minutes left (sometimes switches to 13 minutes). I tried it this way because I thought the problem might be that my USB2 key is too slow. I then wiped my Time Machine partition on the external 2Tb USB3 HDD (because I want to switch from a local TM backup to a networked one, connecting the drive directly to my router instead of the iMac, and local and networked TM backups are apparently not compatible) I put the High Sierra installer on the newly created partition and booted up the installer, no problem.
Tried it on the iMac and on the Macbook Pro. I left it there for over 2 hours, and nothing happens. The installer boots up just fine, but gets stuck halfway (not frozen, because when typing CMD-L, it says installation in progress).
I've tried with 2 USB keys, one USB2 with 8Gb which I used to create the installer, and the other USB3 128Gb key to install High Sierra on. I also have a mid 2015 15 inch Macbook Pro, which had Yosemite as the original OS. My iMac is a mid 2017 27 inch model, came with High Sierra installed.
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