Answer:
Longer than a decade and shorter than a milennium
Sally, Lisa, and Bernadette are triplets. But Sally and Lisa share something that Bernandette does not. What is it?
What occurs once in a minute, twice in a moment and never in one thousand years?
This type of corn swells up and bursts into a crisp puff when heated.
These are believed to be found at the end of rainbows
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.