Final answer:
Persephone stayed with Hades for commonly six months of the year, corresponding to autumn and winter, symbolizing the cycle of the seasons.
Step-by-step explanation:
Persephone, the daughter of Demeter, had to stay with Hades for part of the year, which amounted to a few months annually. The exact number of months, however, varies among different versions of the myth. Most commonly, it is believed that she spent six months with Hades in the Underworld, which corresponds to the autumn and winter seasons, and then returned to the Earth for the spring and summer, representing the cyclical nature of the seasons and agriculture. This myth was a central theme in the Ancient Greek Eleusinian Mysteries, which celebrated the story of Demeter and Persephone and symbolized the regeneration of life.