Related Clues:
- Umpteen millennia
- Mind-boggling time span
- Reeeeeeally long time
- Very long time (Var.)
- Longest division of geologicalà time
- Gigayear
- Forever and a day, facetiously
- It's a real stretch
- Astronomically long time
- It seemingly never ends
- "___ Flux" (Charlize Theron film)
- 1,000,000,000 years, in geology
- Vast timeframe
- "___ Flux" (animated series)
- Long historical episode