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650,000 divided by 8 = 81,250 a day. Could easily make it only 7 days because they would have needed at least one workday to prepare. So 650k divided by 7 = 92,857. What's a reasonable number of emails that one could reasonably expect a single person to review in an 8 to 12 hour shift? Maybe 100 (just to pick a generous round number)? Maybe 200 if they really push it?

So they probably used the type of software designed to scan for certain words or combinations of words. A high-speed scanner can read about 200 pages per minute. There are 1440 minutes in 24 hours. So at that rate, 200 x 1440 equals 288,000 in 24 hours. High-speed scanning for certain words or phrases is the only way 650k documents could be reviewed in a week.

However, such a method would only be as good and accurate as the programming used to identify selected words and phrases.