Create a trigger to start a time line

Hi guys,

I am building a quiz course and all my questions have a trigger that will change layer after 30 seconds, as if to imitate a timer per question. 

I am adding courses with audio. The user will click on an option to play the auido. then I want to time 30 seconds and change layer from the end of that audio. Is that possible? or this there another method?

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