Related Clues:

• Long, long time (Var.)
• Long time division
• Geological time span
• Memorable era
• Span longer than an era
• Exceedingly long time
• Long time span
• Long time, geologically
• It may be after lunch
• Long geological stretch
• A billion years, to Hubble
• Coon's age
• Miocene, for one
• Dog's age
• Eternity, seemingly