the simple version is this:
once charmed, a mob can potentially break a charm once every 6 seconds. in order to do so, against enchanters, he must make 3 saves:
a save based on the difference between the level of the enchanter and the mob
a save based on the MR of the mob
a save based on the charisma of the enchanter
if he makes all three of these saves, charm will break and the mob is free.
as you can see, charm duration is anything but "random," it is based mainly on a variety of statistics that can be manipulated to the enchanter's advantage. the simplest, and one that takes the least preparation, is to lower the MR of the mob you are charming.
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