How to add a timer to your Google Slides presentation by inserting a video

You can add a timer to your Google Slides presentation by inserting a YouTube video into each slide.
Fast Company

This free web timer puts your computer’s Clock app to shame

For something as simple as setting a timer, the built-in apps on our computers can be awfully fiddly. Usually you have to open a Clock app first, then navigate to a separate tab for timers. After that ...