From loraen's ench guide:
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Of course, we obviously want charm to last as long as possible, and the main determinants of charm duration are Mob Level, Magic Resistance, and Charisma, in that order. Therefore your first choice is what level of pet to charm. At L60, I would guess that a L46 froglok dar knight will stay charmed about five times longer than a L53 froglok ilis knight. If you are getting too many charm breaks, go with lower level mobs. For example, there are two ways to solo the necrosis scarab camp: the fast way is to charm the krup roamer, but there is no shame in bringing one of the lower level frogs over from across the moat. For reasonable charm durations my recommendation is to charm something 0.75-0.85 times your level; at L60 this works out to L45-50; 51 is possible but risky and 52-53 is almost certainly going to be a short trip without malo.
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I think this is based on findings in
this thread from 2013 where lvl 53 mobs charm time averaged around 90 seconds. Anyone who charmed anything will know that this is pretty short. Spent 56-58 in frenzy and the few times I tried keeping a pet around for as long as possible I've had some hit the max duration of allure which was about 18m30s (I set a gina countdown timer for 18mins when I start casting charms). So mob level absolutely has an impact post 50 it seems. This thread also tries to demonstrate the usefulness of charisma at higher levels but it is hard to get a good sample solo when ilis frogs double for 400. Also, it is important to keep in mind cha has diminishing returns after 200.
Anecdotally I think MR makes a huge difference too because sometimes I go to Lguk or other lesser zones and I'll just pop a charm on a mob without tashing to trash a camp real quick and those charms seem be very short more often than not even though the mobs cap at like level 40.
And yes, cha is vital for lull crit fails and if you do any sort of dungeon crawls, lulls will often be your most casted spell. In some tricky places I've used lull crit fails to pull and stripping down all my +cha only pieces (-50ish) and taking off cha buffs made the process much quicker.