It took over 10 minutes to recover a 4GB pen drive (via a USB 3.0 connection, it worries me how long it would take to recover my 3TB drive.

If it takes 10 minutes for every 4 GB then it would seem that a 3000GB drive would take 3000 divided by 4 which equals 740 X 10 = 7500 minutes or 5.2 days. That's assuming the larger drive had been full previously. And that only includes the time to scan, not to recover. From the results of my initial scan which recovered nearly 150GB of files from a 4GB pen drive, the recovery for that was 7 hours. so on top of the 5.2 days we are going to more than double the time to recover previously deleted files. Crazy times. in principle this software sounds brilliant, but I don't fancy leaving my computer running for so long; then aasin, if the software was inportant, no amount of time would seem bad. Of course all the above calcultions are based around a single triel so cannot be said to be significant. :)