Force learner to view a slide for a specific amount of time

In Captivate 5, is there a way to force a learner to view a slide for a minimum amount of time -- and to grade them on viewing for that amount of time?

Let's say that you need the user to stay on a slide for a minimum 30 seconds. Here are two ideas:
Idea One: Delayed Navigation Buttons
Set up the Captivate slide so that when the user initially lands on the slide there is no navigation on that slide. (This means the playbar can't be on that slide either.)
Set up the "next" button to appear when the playhead reaches 30 seconds on the timeline.
This will ensure the user stays on the slide for at least 30 seconds because there is no other way to move ahead. ( I'm a little unclear about how your grading system works, however, perhaps the "Next" button could also have points associated with it that you could use for grading purposes.)
Idea Two: Points Attached to a Button
When the user arrives on the slide, they are told they need to click a specific button in order to get points; however, that button will only appear when the user has been on the slide for 30 seconds.
In this case, the button could also have a point value which you could use for grading purposes.

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