I pushed hard to increase to 4, and wanted 5, because we were getting crushed at one point, and one of our current mods was taking the brunt.
Things seem to have normalized, such that, unless my fellow mods are calling for expansion, I'm ok with the present condition.
I personally haven't had much time in the last couple of years, but I was also burned out ...
There's no official limit. StackOverflow has the most, with 24, but sites the size of AI.SE typically have 3-4 (though AI.SE has had more simultaneously in the past).
StackOverflow currently has 24 ♦moderators but they also get 10 million visits/day and 5.7k questions/day right now.
Here's the sites that have approximately the ...