Related Clues:
- Important period
- DMV wait time, seemingly
- Nonspecific duration
- Quite a stretch
- Vast expanse of time
- Geologic time unit
- Pleistocene period
- 365 billion days, in astronomy
- Several eras
- It's quite a stretch
- Oodles of time
- Incredibly long time
- Proterozoic or Archeozoic, e.g.
- Period of many years
- Extremely long time