This timer first counts down to the top of the hour, then down to 54:00--to the
beginning of the music cue.

So, for example, if I start the timer between 3:00 and 4:00 PM, the timer first counts down
to 4:00 PM (the start of the show). Then it counts down to 54:00, the beginning of the
last minute on the air.

Backup timer: this timer just counts down to 54:00. This is useful in case the timer on
this page gets out of synch with the real-world clock.