Related Clues:
- 1,000,000,000,000,000 years, give or take
- We're currently in the Phanerozoic one
- Billion-year stretches
- Geological units
- Extensive geological time
- Many, many ages
- Mountains have grown over them
- Extremely long geologic division
- It's been a long time
- A freaking eternity, like how long it's taking you to finish this puzzle
- Word found in 'time on end,' appropriately
- Vast period
- Myriad years
- Time thats long as fuck
- Life span of a star