[Request] Countdown timer

Hi, sorry this is so late.  I got kind of busy after my last post.

Anyway, I started on a simple implementation a couple hours ago when this thread popped up again (before I saw rfindley’s post here).  It should be just about done, but I need to wait a little while until I have more reviews, just to test and make sure everything’s working as it should.

Edit: I did the thing.  See this thread.