64GB running through a card reader/USB2 adaptor? 2 to 3 hours, maybe.
I run recovery's (data or Windows system) on a dedicated machine while I wander off to do other stuff, so I don't really time them. It also depends on how many data blocks need to be read multiple times...in other words, the more blocks that are damaged, the more passes the software needs to do to rebuild the individual blocks.
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