Venus takes 243 Earth days to spin once, but only 225 to orbit the Sun — so a single Venusian day outlasts its year.
Saturn is mostly hydrogen and helium, giving it a density lower than water. Find a bathtub big enough and the ringed planet would bob on the surface.
Tidal friction slowly pushes the Moon outward and lengthens our days. In the age of dinosaurs a day lasted about 23 hours.
