The characters are discussing the distance of the ruins, which span from the river to the base of a nearby mountain, roughly half a kilometre. Percy, unfamiliar with the metric system, seeks clarification in familiar terms, asking how far that is in regular measurements. Frank responds with mild frustration, pointing out that the measurement is standard outside of the United States. Hazel steps in and converts the distance into football fields, making it relatable for Percy.

This exchange highlights the differences in measurement systems between countries and serves as a moment of lighthearted banter among the characters. By using examples familiar to Percy, they bridge the gap between their differing perspectives, showing camaraderie and teamwork as they navigate their adventures together.