Related Clues:
- 10 million centuries
- One twisted after a big stretch?
- Reeeeeally long time
- An extremely long period of time
- Geologic-time measurement
- A frickin' long time
- Very long time period
- Extremely long unit of time
- Time one changed
- One form of eternity
- Major division of geological time
- (Long) period of time
- Indefinitely long period of time
- Many a DMV wait, seemingly
- Longest division of geological time (var.)