Rolling countdown timer

I would like a widget or notification to appear on a schedule.

We have a garbage truck every other Wednesday. I would like to have a countdown timer to shown when the junk car would come. In five days, four days, three days, etc. And the counter would start from the beginning when the time is full.

There is a countdown timer, but maybe I don’t know how to use it or the thing I want is impossible to do with it.

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