Related Clues:

• Hoped-for low number: Abbr.
• Memorable period
• Time on end
• Many, many moons
• Unit of Time
• Special time
• Historic period
• Chapter in history
• Billion years, to a geologist
• Millennia upon millennia
• It seems like forever
• Stat that's good when under 3.00
• Many centuries
• Millions of years
• Big time?