Update:
I found another thread with an answer from ChrisIceBox, and the answer was this:
Since this thread was posted, AC has a dedicated Timer feature. You can create a Timer from the top toolbar, under Adventure Creator -> Editors -> Timers …
Just an update:
I was able to create a Menu with a label that displays the variable I created that displays 300, but that is not linked to the Timer that I have. Is there a way to connect them together?