How Fast?

Little Johnny was talking to a couple of boys in the school yard. Each was bragging about how great their fathers are. The first one said: "Well, my father runs the fastest. He can fire an arrow, and start to run, I tell you, he gets there before the arrow!" The second one said: "Ha! You think that's fast? My father is a hunter. He can shoot his gun and be there before the bullet!" Little Johnny listened to the other two boys and shook his head. He then said: "Sorry, dudes... but MY DAD is the fastest. He's a civil servant. He stops working at 4:30,... and he's home by 3:45!"