Is there a simple way to calculate the length of a project

I have a fairly simple project in Storyline 2 for a client. It is completely linear, is narrated and includes a couple of videos, and I need to know the total length it would take someone to go through it.

Is there a quick and dirty way to do find the total length of the project if someone were to sit there and click through it other than sitting with a stopwatch or adding up the length of each slide? Thanks

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