Ok. You're right. It did in fact take a long time. Thankfully not 26 hours though. It did complete some time over night though and I got emails saying both drives Passed.
So next step...back it up?
I'm guessing I pull the drive with the most data, plug it into my USB dock, then transfer the data that can not be replaced (photos, home movies) to an external usb drive. That's how I'd go about it. Any suggestions otherwise?