The length of one day on Venus is equivalent to 243 days on Earth. According to Universe Today, Venus orbits the sun in just over 224 days. This means that a single day on Venus lasts longer than its year.
Not only does Venus rotate at a much slower speed than the Earth does, but it is also spinning in a direction opposite to that of the other planets within the solar system. Astronomers hypothesize that the reason for this is a collision between Venus and a massive planetoid in the distant past that caused Venus to turn over completely so that it is now upside-down.