Final answer:
In 'The Giver', the length of the December Ceremony is not directly stated. It is an annual event central to the society in the story, differing from historical December celebrations linked to the winter solstice in various cultures.
Step-by-step explanation:
The December Ceremony in the book 'The Giver' by Lois Lowry is a significant part of the story's setting, taking place in a dystopian society. It is not directly mentioned how long the Ceremony itself lasts, but it is a focal point of the narrative happening once a year and encompassing a series of rituals. This is different from historical celebrations during December, which have been a part of many cultures, especially those in the northern hemisphere, where people gathered to share food and warmth during the shortest, darkest days of the year, surrounding the winter solstice on December 21.