I have also seen people make circular health bars / timers using masking, but that usually makes my head hurt, so here is a way using semi-circles and having the parts arranged so that it gives the effect you are looking for...
one of the "elapsed" semi-circles is rotated, but since it starts at a lower z-order than the other side, it appears to grow from the top. When it gets half way, the "elapsed" pieces move up in z-order to continue the effect.
You can set the global variable CountDuration to anything you want (in seconds), but I zeropad it to 2 digits so if you want more than 60 seconds you would have to fix that.
https://www.rieperts.com/games/forum/CircularTimer.capx