But the length at the water line of a Nimitz class carrier is 1,040 feet... Based on the well known formula for hull speed(1.34x sqrt of the length of the waterline), that puts the max speed of them at about 43 knots... Or right about 50mph. While some designs allow for exceeding hull speed, It's fairly doubtful that a ship the size of an aircraft carrier can utilize those methods. It's possible that they don't have the engine power to make 43 knots, but I bet that they come very close to it.
Actually, most cats will have an estrus cycle (the technical name for heat) within six to eight weeks after giving birth. In rare occasions, a cat will have an estrus cycle within a week after her kittens were born.
It can take up to an hour for the first kitten to be born after she enters the second stage of labor. Once the nose and paws of the kitten appear, the kitten should be born within 15 minutes. Call your vet if the birth of the kitten is past 15 minutes, or if the nose and feet appear then disappear during her pushing.