Were you using the same checkbox settings both times?  The Auto Clear and hair refinement add time.  as far as I recall

Were both batches TIF?  Saving PNG will add time.   TIF

Also, were you saving to the sane drive for bot batches?   YES, internal HDD

What disk are you using for scratch disk? Are you using the OS Dive or an external.  I suggest using an external SSD and turning the system drive off in the scratch disk. Even if you have a 4TB drive, you don’t want to put that excessive wear on the SSD by letting Photoshop abuse it with writing large files over and over.   INTERNAL

If that was saving TIF then the times does seem higher than.  I suggest restarting the computer to see if it comes back down.   WILL TRY