Why do snapshots take so long for First Aid to process?

Had a short power outage this evening. One of my backup disks is not on UPS. So I thought I'd run First Aid on it to be sure there are no errors. My question is, why does it take so long for First Aid to process the snapshots? Is it reading each byte a dozen times? Each snapshot takes several minutes or more, and with 69 of them now, it's going to take hours! Is there some way to skip the snapshots? Maybe by using the fsck_apfs command in Terminal? (NOTE: This is a backup disk, not the system disk [startup disk], so I can't delete them, as they are the actual backups!)

Disk Utility 21.5

macOS 12.7

24" 4-port M1, iMac21,1

TIA!