Last seen in:
- Wall Street Journal - Oct 10 2015 - October 10, 2015 - B & B's
- Wall Street Journal - Feb 27 2015 - February 27, 2015 - Positive Reinforcement
- Wall Street Journal - Mar 28 2014 - March 28, 2014 - Sloganeering
- Wall Street Journal - Sep 6 2013 - September 6, 2013 - Academia Nuts
- Wall Street Journal - Apr 23 2010 - April 23, 2010 - Presented in 3-D
- Universal - Jul 19 2009
- Wall Street Journal - Dec 8 2006 - December 8, 2006 - Caveat Emptor
- New York Times - Dec 1 2005
Related Clues:
- Many, many epochs
- Millions of millennia
- It's a long time
- Geological timespan (Var.)
- Unit in a geology book
- Very long period
- Mountains have developed over them
- Long time to wait
- Ages and ages (var.)
- Immense time span
- Forever and a day (Var.)
- Quite a long time (Var.)
- Length of a boring class, so it seems
- Billion years (var.)
- Long measure of time (Var.)