Related Clues:

• 669 Martian days
• Revolution time?
• Spring, summer, fall and winter
• Summer to summer
• 2006, e.g.
• Leap __
• 2008, e.g.
• Period of revolution?
• 1776, e.g.
• Diary capacity, typically
• Almanac volume
• Sentence segment
• Academic period
• Diary's duration
• Calendar capacity