Related Clues:
- Gazillion years
- Long span
- A while, in hyperbole
- Myriad eras
- Time span in a geology book
- Bunch of eras
- Numerous centuries
- Apparent stretch between Christmases, to kids
- One billion years (var.)
- Quite a long while
- Listless on reflection for long period
- Long, long, long time
- Seemingly endless span
- Hard-to-imagine period
- Near-infinite time span