Duration reset on status change

I know this has been discussed before, but I have a slight problem with the way duration is calculated.

I need to send an Email if a test is yellow, and escalating pages if it is red. My problem is that a test went yellow over the weekend when nobody was checking Email, then in the middle of the night went to red. Which caused techs, backup techs, managers, and the CEO to be paged because the duration was over 24 hours.

Is there any way to reset the duration counter when the state changes. Instead of just when the state changes from green?

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