Related Clues:
- Division of history
- Considerable stretch
- A looooong time
- Forever, facetiously
- Geological time division (Var.)
- Geological time period (Var.)
- 1 billion years
- A billion years (Var.)
- 365 billion days, astronomically
- Interminable stretch
- '-- Flux' (1995 TV series)
- Almost eternity
- Longish span of time
- Millennia on end
- Historical segment