White Horse firemen daily routine

The transcript describes a typical afternoon in the lives of two individuals. Chief Ed Hill, who has been working since early morning, is preparing for his afternoon nap. Meanwhile, Frank Kessler is busy servicing a car and planning his schedule to be in Lawrenceville by 4:30.

How long had chief Ed Hill been delivering milk before the events described?

What was the reason for Frank Kessler's time constraint?