Trigger an action after set amount of time for the course (not individual layer)

Hi Heroes,

I am working on a course that has many slides and scenes. I want to show an alert to the users every 15 minutes. Please note, this is specific to time spent in the course (not layer). So even if the user is sitting idle...after every 30 mins s/he will get this alert.

Maybe something to do with a counter that is triggered at the beginning of the course, which reaches to 15 minutes and triggers the show layer command. Not sure how to do that. Any help would be greatly appreciated.

Thanks in advance.

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