I began the Recuva scan about 2 hours ago. The first drive scanned in about 30 minutes. The second drive has been scanning for 1.5 hours and the progress % just keeps increasing and is at 17450% the green progress bar goes to full then starts over continually. The estimated time rapidly changes from 33 days, 7 days, 5 days, 1 day, 41 days, 11, days and just keeps changing rapidly. Should I just let it run?
The estimated time is bascally just a guess, I always ingnore them in any software.
How long a Recuva scan will take will depend on what options you have set, and of course the size of the drive(s) to be scanned. Modern drives are much larger than they were just a few years ago.
I'm not really familiar with Recuva myself but I'd leave it running.