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In Burnstats you can set the encounter timer, on the first tab. Setting is called Encounter change threshold. Having 30 seconds is normally enough, but increase or decrease as you wish.

In ACT you...

Burnstats by far.

http://forums.ageofconan.com/showthread.php?183237-Burnstats

ACT has more details but it's usage is more complicated and for just checking damages or heals, Burnstats does...