Clue: Billion-year span
We have 1 possible answer for the clue Billion-year span which appears 4 times in our database.
Possible Answers:
Related Clues:
- Extremely long period of time
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- A long time in school, not a short time
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- Geochronological span
- Century upon century
- Extended period of time
- 100,000,000 decades
- Many millennia make one
- Frustrating waiting time, facetiously
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