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- Long, long stretches
- Not just centuries
- So long!
- A kazillion years, it seems
- Boarding school jackets
- 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
- Mountains have developed over them
- Long time to wait
- Principals in Eugene Onegin not singing for ages