An event cannot be a certain time, so to disable a button for a certain duration is not possible.
However try out this workaround: put a click box on top of the next button (by definition invisible), time it for 4 seconds, without pausing and with 'No action' as choice for the action to be triggered. As long as the click box is on the stage on top of the Next button, the last one will not be available. Be sure that the click box is on top of the Next button in the Timeline!
In addition to what Lieve described, I'll also advise of how I managed to do this.
Create an image of the button in a disabled state. That provides a nice visual cue that the button is disabled. Then insert the image in the same screen location as the button. On the timeline, present the image for the time the button is disabled. Then configure the image to disappear and at the same point have the button itself appear.
Worked a treat for my project.
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Thank you for your suggestion. Great idea.
Best Wishes .. Les
Think this is even a nicer solution idea than LilyBiri's idea as it provides a visual cue to the user.
Kudos to both of you.