Based on further experiments by Lindy, Erin and Lindsey, we've now got the following situation:
Archives:
done so far : ~2000 warning messages
still to do : ~13000 warning messages
going at : ~100 warning messages / day
Therefore, about 130 person-days (13000 warnings / 100 warnings per day) or 900 person-hours to go as of July 22.

Case Files
done so far : 11 reels
still to do : ~120 reels
going at : 5-6 minutes per case file or about 2.5 person-days per reel (to do person, family, gender, citizenship, where sent to, if exiled to Japan, birthday, occupation, employer, home address)
Therefore about 300 person-days (120 reels x 2.5 person-days / reel) or 2000 person-hours to go as of July 22.

Lindsey has 14 days to go so should get through about 1400 warnings.
Lindy and Erin each have 24 days to go so should get through about 10 reels each, 20 reels total.
As of Aug 31
total warnings done = 3500; warnings to go = 11,500 or about 120 person days or 17 person-weeks.
total Case File reels done = 30; Case File reels to go = 100 or about 250 person-days or 35 person-weeks.