Catalina Boot camp still on partitioning

Zimbop

Registered
Macbook Pro 15in 2019
SSD
MacOS 10.15.7 Catalina

Trying to install windows, bootcamp assistant 75% complete in "Partitioning Disk..." phase for 3 hours or so now. It isn't hung (no beach ball) and isn't complaining. I can operate the system and I can look at "About" in the bootcamp assistant menus etc so seems happy enough other than the sheer time it's taking!

Disk Utility shows Macintosh HD, Macintosh HD - Data and disc image that begins "CCCOMA_X86"

Not sure what to do here really. Or how to stop the process ("Stop" is greyed out!).
 
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