Related Clues:
- Gazillions of years
- Lunch ending
- Longest division of time, in geology
- Large timeline segment
- Very long spans
- Billions and billions of years
- Astronomical stretch
- Long, long, long time period
- Long periods, geologically
- Vast span
- Long geologic stretches
- Giga-year
- A billion years, in astronomy
- Reeeeeally long time
- An extremely long period of time