Related Clues:
- Considerable age
- Extended stretch
- Part of the Thermopylae onslaught lasted a long time
- 365 billion days
- Billion years, in astronomy
- Period of unspecified duration
- Length of a long wait, in hyperbole
- 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
- "___ Flux" (Theron film)
- 1 billion years, in astronomy
- Long time stretch
- Change as one ages