Storyline 2 Calculate Duration Automatically

How does Storyline 2 automatically calculate the length of a course when there is no audio narration?  I have a course that shows an estimate of 74 minutes. There are several video clips that have a total time of 24 minutes.  I'm wondering if the auto calculate is counting the duration/length of each slide that does not have a video, or is it counting the words and calculating an estimate on that data?

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