Related Clues:

• Many a millennia
• Clock watcher's wait, seemingly
• Endless years
• A lo-o-ong time
• Two or more eras
• Geologist's measure
• Time on end
• Many, many moons
• Unit of Time
• Billion years, to a geologist
• Millennia upon millennia
• It seems like forever
• Many centuries
• Gets on
• Historical periods