Do you ever feel there aren’t enough hours in a day? The dwarf planet Haumea takes approximately four hours to complete a full rotation, making it one of the fastest rotating large objects in our solar system. This little planet is about one tenth the size of Earth and is more oval in shape than round. Haumea can be found in the Kuiper Belt, just outside the orbit of Neptune.
(https://go.nasa.gov/2BmGQB6)