Related Clues:
- Geologic time period
- Eternity (Var.)
- Phanerozoic, currently
- Big time for crosswords?
- Two or more eras, in geology
- Endless time
- Interminably long time
- Countless years on end
- Tons of time
- Megayears
- What a houseguest's stay might feel like
- Astronomer's time period
- Long time period
- Long interval
- ''___ Flux'' (2005 movie)