At one time on live servers root spells had a random duration component built into there timers. If you look closely at the way the spells are worded it says it can last up to Z amount of time. Meaning the duration was not a set number. Most had a minimum duration Y plus a random duration X which could potentially be Z but rarely happened. Both resists and other effects come into play on the true duration of the spell effect.
Snares seemed to have just an initial resist check then a set duration but I never really used them much so that is just a guess. I don't know how fears and charms worked so i won't comment on those.
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