Related Clues:

• Its make-up is many years
• What a waiting time may seem
• Historical division
• Bold alternative
• Mighty long time
• Quite a spell
• Nomo number
• Historic block of time
• Hurler's stat.
• One billion years, in astronomy
• Group of eras
• Important time in history
• The Roosevelt years, e.g.
• Christian, for one
• Noteworthy period of history