Create a Timer for Multiple Slides in a Course

Hello, I have a course that requires a five minute timer on 10-15 different slides.  I've tried some of the pre-built timers that I found on here, but the variables carry over from one slide to the next, so the timer doesn't start at five minutes as you move through the course.  Is there a simple way to add a timer to multiple different slides without having to have a different set of variables for each?

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