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Related Clues:
- Eventful time periods
- Tons of time
- Big band and Roman, e.g.
- ''-zoic'' time periods
- Horse-and-buggy and others
- Two-term presidents' tenures, e.g.
- Precambrian and Progressive
- Periods of history
- Pieces of history
- A billion years, geologically
- Two-term presidents' terms, e.g.
- Very long stretches
- Federalist and Imperialist, for two
- Almost an eternity
- Long lines on a timeline