| 100% | EON | 3 | Geological unit of time equal to one billion years |
| 100% | EON | 3 | Period of time roughly equivalent to one billion years |
| 99% | EONS | 4 | Billions of years |
| 99% | EON | 3 | Billions of years |
| 90% | AGO | 3 | "The big bang happened billions of years ___." |
| 88% | RIPEOLDAGE | 10 | Wonderfully high number of years to have lived |
| 88% | SWIMSUITSEASON | 14 | Time of year to bust out your Speedo |
| 87% | EONS | 4 | Billions and billions of years |
| 85% | COLLISION | 9 | By some calculations, projected fate of 4-Across and 34-/35-/36-Across in three to four billion years |
| 85% | EON | 3 | Billions and billions of years, say |
| 83% | EONS | 4 | Periods of billions of years |
| 83% | EON | 3 | Billion years to an astrologer |
| 80% | UBER | 4 | Rideshare service that provides billions of rides per year |
| 80% | LIFESPAN | 8 | Period of years from birth to death: 2 wds. |
| 80% | BAGUETTES | 9 | The French consume 10 billion of these a year |
| 80% | EON | 3 | Equal to a billion years |
| 79% | EON | 3 | Span of a billion years |
| 79% | EON | 3 | Period of a billion years |
| 78% | HARVEST | 7 | Time of year when crops are ripe enough to pick |
| 78% | NEWTON | 6 | Scientist Isaac, first to observe laws of motion |
| 78% | EON | 3 | Geological period of a billion years |
| 78% | TEEN | 4 | 13 to 19 years of age |
| 78% | AEON | 4 | A billion years, to Brits |
| 77% | HUME | 4 | David who took 15 years to write "The History of England" |
| 77% | ISAAC | 5 | Scientist Newton, of no relation to the figgy cookies |
| 76% | ASIA | 4 | Home to billions of people |
| 75% | 7BC | 3 | Year that Dionysius of Halicarnassus is believed to have died |
| 75% | SUMMERY | 7 | Relating to the warmest months of the year |
| 74% | DIAMOND | 7 | 1 billion years of pressure turns carbon into this |
| 73% | ROARING | 7 | Name given to the prosperous years of the 1920s |