Countdown timer across several slides/scenes

Hi

I am developing a scenario based challenge for a New product sales course where the participant has a set time to deliver an elevator pitch - by answering questions, completing activities (like picking the right audience, picking the right messaging for the person they are pitching to) etc.

as it is supposed to be an elevator pitch I want to set a time limit to complete the challenge - but cannot work out how to have a timer across several slides and scenes

Can anyone provide either a suggestion as to how to do this... or even better a template :)

ThanksĀ 

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