There have been a lot of requests for a built-in timer/ stopwatch feature:
Others have created samples that add/edit rows to measure a duration:
But there’s no live countdown (or count up) on the screen.
This sample app uses a different approach, to create a live countdown:
The timer sheet just stores the duration, and a name for the timer.
Then an Action is used to open this 10 minute ‘countdown’ video on Youtube.
The URL parameter
start=### can be used to start the video at any point.