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Almost always seven. Most calendars during the Bronze and Iron Age were lunar-based. Since the lunar month is 28 days, it gets split into half-months (14 days) and weeks (7). Even non-lunar calendars still use the 7-day week. The Amorite calendar had 7 jubilees each year, where each...

Maybe that's the first time it shows up in the Bible, but from history and archaeology we know the whole Middle East was using a calendar of weeks and weeks of weeks as early as the 3rd millennium BC. Historians think the Amorites invented it, and it was adopted by the Canaanites and...