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08:36
@ToddTrimble From the outsider view I'd guess that the most frequent thing a moderator has to do is handling flags (mod flags can only be handled by a moderator, IIRC if a post lingers for too long in some of the review queues, the flag is also moved to moderators) - which makes the claim about "50 by-hand actions in the last year" a bit misleading (probably unintentionally), since this number is about a very specific subset of mod actions. (The details are listed in the linked query.) Out of curiosity, how many flags do moderators handle per year? Hundreds? More? — Martin Sleziak Dec 30 '18 at 19:27
@MartinSleziak As a very rough estimate, something on the order of 1500 per year, give or take. Many of those are routine. — Todd Trimble ♦ Dec 30 '18 at 23:21
According to this recent post statistics moderators on Mathematics in 2018 are: Question flags handled: 3,750; Comment flags handled: 13,884; Answer flags handled: 4,769
This makes one really appreciate the difference in the size of the two sites (and, consequently, in the workload for moderators).
 
2 hours later…
10:20
In many stats Mathematics is about 10x bigger than MO (questions, questions per day). The ration seems a bit higher for the number of flags.

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