How To Make a 1.0 Natural Timer In the Overlay Device (In blocks tab)

You can make a property with the starting value (40 in your case, name it TimeLeft or something like that), and every second decrement it with a trigger loop, and set the block code in the overlay to this:

Set text: Create text with: "Next disaster will start in "
                          : Get property: TimeLeft

When the trigger is activated, you can make it broadcast on channel TimerChange, and run the block code when receiving on that same channel

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