Related Clues:
- Long, long stretches
- Not just centuries
- So long!
- A kazillion years, it seems
- End of a lame pickup line
- 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
- Again and again, field officer returns cross
- Millions of millennia
- Mountains have developed over them
- Long time to wait