A variation on this that I love is Tim Urban's "Your life in weeks" visualization.
https://waitbutwhy.com/2014/05/life-weeks.html
This is a progress bar, not a countdown clock. Personally, I find it super helpful in keeping perspective on the value of my time.
I do not mean to detract from OP's work (which is cool), I just thought others reading the comment might enjoy this other article too.