Adding timers to list of links in frontmatter

I’m looking for a way to add timers to a list of links situated in the frontmatter. When the timer value reaches 0 the link will be removed from the list.

Also curious about how i could trigger a count down periodically.

Things I have tried

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Adding the timer next to the link breaks the link, which is a problem when i move stuff around.

What would be a good way to approach this problem?

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