Related Clues:
- Hyperbolic wait time
- Length of time spent on hold, it often seems
- Long time to wait, facetiously
- Time period of 1 billion years
- Interminable span
- It's quite a long time
- Period divided into eras
- Mega years
- Long wait time, seemingly
- Dating periods for geologists?
- Now we're in the Phanerozoic one
- Vastly long time
- Geologic spans
- European broadcasting for a very long time
- A gazillion years