The children were notably impressed by Mr Key's description of his typical day, which he said began with a run at about 5.45am.
"I take my police officers with me, but they're a bit soft so sometimes they can't keep up,'' Mr Key joked.
As he went on to describe the various media interviews, visits and meetings he had attended today, one girl responded simply with "Wow''.
Mr Key also revealed that he always carried cash in his pocket, and that he preferred dancing to singing because he "couldn't sing to save myself''.
A series of "quick-fire'' questions had the potential to land the Prime Minister in some trouble, particularly in the moment when he chose TVNZ over TV3 with an explanation that TV3 had treated him badly the previous night.
He received great support from his audience when he chose North Island over South Island, and McDonald's over Burger King -- "Happy Meal, you know''.
The answers that seemed to divide the children, were his preference of Superman over Batman, and his choice to get up early rather than sleep in.