Which planet in our solar system has the shortest day?

Jupiter absolutely smokes every other planet in our solar system, spinning a complete rotation in just 9 hours and 56 minutes. The massive gas giant whips around so fast it actually squishes itself at the poles, making it look like someone sat on a beach ball, and the winds at its equator rip through space at about 28,000 miles per hour. NASA scientists think all that spinning is leftover momentum from when Jupiter was forming, as it sucked up tons of space debris and gas like a cosmic vacuum cleaner, getting faster with each bite.