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The answer, in my particular case, was about 500MB per minute, meaning it took over 26 hours to copy my 800GB.

The exact same hardware configuration copies sectors at an average 150MB per second using ddrescue. My file copying was no doubt slowed down by a large chunk of my data being spread out ...

Thank you Christophe for the life-saving program testdisk!

I have one question: Roughly how fast does testdisk copy files?

I realize that depends on a host of factors like hard drive speed, hard drive health, file size, cluster size etc, but let's assume the source and target are both perfectly ...