Related Clues:
- Millions of centuries (Var.)
- About 525 trillion minutes, in astronomy
- Lo-o-o-ong time (Var.)
- Uncountable years
- "___ Flux" (2005 Charlize Theron movie)
- Time in earth's history
- Astronomical time span
- Eocene, e.g.
- Umpteen years
- Forever, more or less
- Historical stretch
- Immeasurable period of time (Var.)
- Vast time span
- Oligocene, for one
- 365 billion days, geologically