I think it would be a useful UI improvement to at the end of a disk wipe to mention how long the process took.
+1
It does if you use Wipe Free Space (or did, I haven't used it recently). I've never run it from Drive Wiper so I don't know if this is what you are referring to.
It could be that WFS is run as part of Cleaner, which gives a total run time, where Drive Wiper is a stand-alone process.
Thanks for the suggestion. I've added this to our product backlog.