Disk Utility "freezes" on First Aid scan

Not so much a question as passing along info to others who may experience this. And this info may already be out there so forgive me if I'm beating a dead horse. Late 2012 Mac Mini running Mojave 10.14.6. Intel core i5. 16GB ram. AFPS file system. 1TB HD. Had this occur while running normally; First Aid seemingly froze. Beach ball of death and totally unresponsive to any input. Did a power button shutdown and restarted in Recovery Mode. Ran First Aid. The process did complete but it took quite a *long* time to finish. On my Mini, there were 22 "snapshots", each one taking about 5-10 minutes to complete. In total, this process took upwards of *2 hours* to finish. And everything was normal with the disk. I also did a scan on my 2 TB Time Machine HD. No "snapshots" but a "multi-link check" step that ran for a good hour before completion ...the whole First Aid check ran for more than an hour. And everything was fine with the TM HD.

Not a computer guru, but I suspect this First Aid HD analysis is resource intensive ...so if your Mac is running normally, trying to get the First Aid analysis to run as well causes problems. It may run, but if it took over an hour to do my HD in recovery mode ...I suspect it will be even slower when your Mac is running normally. I've read it's the AFPS filing system causing the long duration of the First Aid disk check So it would appear the best practice is to run First Aid in Recovery Mode.

Has anyone else had the same experience and has anyone had the First Aid process complete while their Mac was running normally?