A day on Saturn, defined as the time it takes to complete one rotation on its axis, is relatively short compared to Earth. Saturn completes one rotation approximately every 10.7 hours. This rapid rotation rate is one of the factors contributing to its oblate shape (flattening at the poles and bulging at the equator). The length of a day on Saturn has been refined over time with better measurements, particularly from spacecraft missions like Cassini, which have provided detailed observations of Saturn's rotation and atmospheric dynamics.