Just displaying the Details expand-down section would take 15-30 seconds. On it for a bit, but it didnt get beyond the output line for the fsckapfs command. Various threads on this site and others suggested the Disk Utility First Aid may help.
It was having trouble when unlocking the screen after going to sleep while a full screen app was running. Startup Repair How Long Does It Take Full Screen App It is up to date with High Sierra 10.13.6. Startup Repair How Long Does It Take By navolreilu1982 Follow | Public
