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Tested over multiple Mortal Empire campaigns, events like Savage Blow, The brutal business and other events continue to persist on AI factions after the event ends. It seems that AI receives the number of turns equal to the number of players in the campaign.
When we had the Brutal Business event it expired on players after 10 turns, as the event says, but AI would have it for 20 turns in 2 people campaign and more than 24 turns in 3 people one(we did skip turns to see if it will expire but it didn't and we got tired of it).
The major thing is, as soon as you get brutal business with +20 base weapon damage, when it expires on the players campaign becomes completely unplayable: basic zombies will shred your demon armies like butter.