A day on the planet Mercury is twice as long as its year.
Mercury rotates very slowly but orbits the Sun at 180,000 km/h
Mercury orbits the Sun in slightly less than 88 days
Its interesting to compare:
The Earth orbits the Sun in 365 days at an average speed of 107,220 km/h
The fastest known Neutron star rotates over 700 times in one second.
Left: Mercury photographed by NASA's Messenger spacecraft, copyright NASA.