how long should it be taking to clean a large hard drive via the "clean all" command?

my friend lent me a 14TB, 3.5" drive in an enclosure so i could share a large file collection with him, but I found out when it got here it just had a single 2TB partition and some annoying-to-delete windows recovery partitions from an old windows backup performed on this drive (something my buddy had forgotten about and wanted fixed). i could've just made a second partition in the remaining 12TB of unused space and let him reformat the drive but i figured i'd go ahead and clean it myself, using the command prompt diskpart -> select disk -> clean all command to get rid of the stubborn recovery partitions. well, as you might expect, it's been 14 hours and it's still cleaning. really don't know what I thought was gonna happen. about when do you think i can finally use this drive again?

i don't have any further specs on the drive (can't safely remove it from the enclosure while in use), or on the USB hub on my computer it's currently plugged into. the drive used to be part of a server pc and has a broken clip, though it's currently seated correctly (i reseated it before starting)