Related Clues:
- Billion years, in astronomy
- Period of unspecified duration
- Little League maxima and minima
- Length of a long wait, in hyperbole
- Gets closer to retirement
- Time it takes for paint to dry, seemingly
- Far too many years to count
- Big chunk of time
- School missing first of teachers for long time
- 1 billion years, in astronomy
- Long time stretch
- "Rock of ___" Grant Lee Buffalo
- Dorian Gray's portrait does it
- Waiting time at the DMV, seemingly
- Long series of periods