Put rectangle to cover the whole slide and make it in the back of every thing (you can make it transparent from format menu if you want), then press once on it, then go to Insert menu and press Action and choose to hyperlink to the Current slide (choose the number of the Current slide), after that add Disappear animation to the rectangle with a delay time you want, then you can click the slide to go to the next slide after the rectangle Disappear.
SEE ATTACHMENT FILE (I make it to disappear after 5 seconds).
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