Years ago OS X Mountain Lion could not delete sparse bundles containing over 262,144 bands (2TB+). I don’t know if that’s still true, but when I had to remove a 1.7TB disk image today I first tried doing an Erase using Disk Utility.
Alas, this didn’t work. When I opened the image it was indeed empty. However First Aid on the volume reported it was corrupt. When I tried deleting it I got the usual OS X hang.
So this problem is still around…
Update: on the other hand deleting the sparse bundle in Finder took 2-3 minutes rather than 12 hours. So maybe there’s something to this.