Clue: Unit of time often used hyperbolically
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Related Clues:
- Indefinitely long period
- Geologic span
- A billion years, in geology
- A billion years, to geologists
- Many generations
- Umpteen millennia
- Mind-boggling time span
- Reeeeeeally long time
- Longest division of geologicalà time
- Gigayear
- Forever and a day, facetiously
- It's a real stretch
- Astronomically long time
- It seemingly never ends
- 1,000,000,000 years, in geology