When running the ASU test, the pause between loops is needed (and then some)

I ran a few tests on a 2TB drive (a bad drive starting to accumulate bad sectors) and it is painfully slow, with 500,000 files per loop it takes hours? (will check) deleting the files.

It might be due to that all files are in a single folder, it is extremely slow and a few days of writing did not help accumulate more bad sectors, it looks like I have to let it die the natural way or try to get it replaced.
(it's a secondary backup drive and I've already cleaned the drive)

Temperature during ASU testing was more or less fixed in the low 40's (C). (42-43)