Rabbi David Kalb:
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The Beit Yosef, a commentator on the Tur, and Shulchan Aruch (two of the most important Jewish Legal Codes) asks an interesting question in Orech Chayim 670. Why is Chanukah eight days long? The miracle of the oil was really seven days, not eight. The Maccabees found one container of oil that was enough for one day. Therefore, Chanukah should be celebrated for seven days, not eight? Seven lights for seven nights, not eight?