Related Clues:

• Time immemorial
• Kajillions of years
• L-o-n-g time period
• Thousands and thousands of years
• A really long time
• Long period
• A very long time
• Time divisions
• It's a stretch
• Eternity
• Many eras
• Years and years and years and ...
• Near-eternity
• Lo-o-ong time
• Many, many years