| L-o-n-g time | 12 |
| Immeasurable time | 17 |
| Geological time division (Var.) | 31 |
| Epochs upon epochs | 18 |
| Endless years | 13 |
| Billion-year period | 19 |
| Astronomical unit | 17 |
| A very long period of time | 26 |
| "___ Flux" (animated sci-fi series) | 45 |
| "___ Flux" (1990s animated series) | 44 |
| Very long time unit | 19 |
| Vast time span | 14 |
| Untold eras | 11 |
| Time spent in line, seemingly | 29 |
| Time spent at the DMV, it often seems | 37 |
| Prolonged period | 16 |
| Multiple millennia | 18 |
| Mind-boggling period | 20 |
| Millions of centuries (Var.) | 28 |
| Million-millennia period (Var.) | 31 |
| Million-millennia period | 24 |
| Many, many centuries | 20 |
| Longest division of geological time (var.) | 42 |
| Long, long period | 17 |
| Lo-o-o-ong time (Var.) | 22 |
| Indefinite period | 17 |
| Immeasurably long time | 22 |
| Immeasurably long period of time (Var.) | 39 |
| Immeasurable time (var.) | 24 |
| Geological age | 14 |
| Forever, seemingly (var.) | 25 |
| Eternity (Var.) | 15 |
| Centuries on end | 16 |
| Billion years (Var.) | 20 |
| Astronomical measurement | 24 |
| Almost an eternity (Var.) | 25 |
| Ages and ages (Var.) | 20 |
| "___ Flux" (futuristic MTV cartoon) | 45 |
| ''___ Flux'' (classic cartoon) | 46 |
| ''___ Flux'' | 28 |
| Very long time (Var.) | 21 |
| Unit in a geology book | 22 |
| Two or more eras (Var.) | 23 |
| Two eras or more | 16 |
| Time unlimited | 14 |
| Time in earth's history | 27 |
| Really long time span | 21 |
| Quite a long time (Var.) | 24 |
| Period that appears endless | 27 |
| Period like a millennium | 24 |
| Part of the earth's history | 31 |
| One billion years (Var.) | 24 |
| Old animated heroine Flux | 25 |
| Mind-bogglingly long time (var.) | 32 |
| Mind-boggling long time | 23 |
| Mighty long time: Var. | 22 |
| Many, many epochs | 17 |
| Many millennia (Var.) | 21 |
| Long, long time for a Brit? | 27 |
| Long time: Var. | 15 |
| Long time, to Brits | 19 |
| Long measure of time (Var.) | 27 |
| Long measure of time | 20 |
| Long geological period (var.) | 29 |
| It's seemingly forever | 26 |
| It seems like forever | 21 |
| It goes on and on and on | 24 |
| Incomprehensible age | 20 |
| Immeasurably long period | 24 |
| Immeasurable period of time (Var.) | 34 |
| Gnostic power | 13 |
| Geological timespan (Var.) | 26 |
| Geological time period (Var.) | 29 |
| Geological time frame | 21 |
| Geological range | 16 |
| Geological period (Var.) | 24 |
| Geological extent | 17 |
| Forever and a day (Var.) | 24 |
| Extended time | 13 |
| Extended period? | 16 |
| Eternity's cousin | 21 |
| Eternity, essentially | 21 |
| Eternity, at Eton | 17 |
| Eras on end | 11 |
| Era after era after era | 23 |
| Epoch's English cousin | 26 |
| Epoch upon epoch | 16 |
| Endless time period | 19 |
| Duration of an ice age | 22 |
| Coon's age | 14 |
| Charlize Theron film, '-- Flux' | 39 |
| Boundless time | 14 |
| Billion years, to a geologist | 29 |
| Ages untold | 11 |
| Ageless time | 12 |
| Age beyond belief | 17 |
| A very, very long time (Var.) | 29 |
| A very, very long time | 22 |
| A long time (var.) | 18 |
| A couple of eras | 16 |