I read an old post that seemed to about this same problem and the solution was to be patient. It didn't state the total time of their restore though. So, my question is can a restore take multiple days to complete? Oh, and as I'm typing this, the estimated time left has increased to 50 hours.
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It should only take hours, it generally operates at a bit slower than the harddrives read/write. You may have an issue with your external drive or the restore got botched, try again. Never had this happen, I'm wondering if some of the stuff got restored.
Maybe the restore have hung or stopped working. It shouldn't completely stop at the same size number for more then a few hours.
Unplug USB storage, let PS4 restart, try different PS4 Pro USB port like the back USB port, and try restore again?