Related Clues:
- Tremendous spans
- Ages upon ages of time
- Geology class periods [subscribe to the best indie xwords today at avxwords.com]
- See 19 across
- A lot of the time?
- Eras upon eras
- Millions of millennia
- Near-eternities
- Mountains have developed over them
- Long time to wait
- Principals in Eugene Onegin not singing for ages
- Sort of Latin not seen in, say, Homer's times
- Forever, basically
- Long time periods
- Seeming eternities