Charm never lasts even close to 22 minutes without a break on any mob worth charming though. I wouldn't even object to changing the max duration to 8 because it rarely lasts that long anyway.
I soloed probably 500 cliff golems on my enc using the undead foreman in OT. Charm would generally break at least once during the roughly 4-minute fight. Usually a quick stun and re-charm would finish it off, but it wasn't uncommon at all for it to break *again* before the end of the fight.
Then I stopped farming cliff golems cause their drop rates are complete shit even during bonus loot.
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