If it is not too late to post, I would like to add to my previous report that I finally managed to clone my C drive containing Windows 10 and the program files. I was cloning from a 500Gb SSD to to 500Gb USB2 external drive. It took 5 hours 24 minutes and at no time, even in the last few seconds, did it express the estimated time remaining anything less than 1 hour 15 minutes. In fact it stayed there or thereabouts for the last 3 hours.
This thread is now locked and can not be replied to.