QUESTION: How long is a Saturnian month? ANSWER from FAQ on June 11, 1999: A month on Earth is defined as the time it takes for the Moon to complete one orbit of the Earth - 27.32 days. But Saturn has many moons whose time to orbit Saturn varies from half an Earth day to more than an Earth year. Perhaps it would be fair to define a Saturnian month using the time for its largest moon Titan to orbit once around. Titan takes about 16 Earth days (36 Saturn days) to go all the way around Saturn.