I attempted to add a partition to my boot drive in macOS High Sierra. In the process, Disk Utility was going to resize my Container disk1. The boot partition is APFS and is in that container. On the same drive, is my BOOTCAMP partition. I didn't delete any snapshots, but the last Time Machine backup ran a half-hour before I started.
After 2 hours, the Mac is stuck on this screen (I can move the mouse but I can't click on anything):
Is it normal for this operation to take 2 hrs on a 512 GB SATA SSD? Is adding a partition to a drive which already has an APFS partition possible? Has anyone done this before?