| Ages |
| Kalpas |
| Long time |
| Big times |
| Millennia |
| Long times |
| Eternities |
| Long spans |
| Time on end |
| Light-years |
| Untold ages |
| Time periods |
| Long periods |
| Ages and ages |
| Big stretches |
| Near eternity |
| Umpteen years |
| Very long time |
| Almost forever |
| Long stretches |
| Timeless times |
| Geologic spans |
| Years and years |
| Near-eternities |
| Time immemorial |
| Many, many moons |
| Forever and ever |
| Time without end |
| Epochs unlimited |
| Untold centuries |
| Long time periods |
| Forever, it seems |
| A long, long time |
| Seemingly forever |
| Very long periods |
| Forever, seemingly |
| Epochs upon epochs |
| Almost an eternity |
| Milord's millennia |
| Seeming eternities |
| Bajillions of years |
| Many, many centuries |
| Ages and ages (Var.) |
| Immense time periods |
| Long periods of time |
| A while, in hyperbole |
| Long times, in London |
| Millions of millennia |
| Earth science chapters |
| Very, very long periods |
| Forever, or close to it |
| Centuries upon centuries |
| Incredibly long stretches |
| Stretches between ice ages |
| Time spent in line, seemingly |
| Extended period, hyperbolically |
| Time it takes mountains to form |
| Incredibly long stretches (Var.) |
| Thousands and thousands of years. |
| Two or more eras in geologic time |
| The time it takes mountains to rise |
| What evolution might be measured in |
| How long it takes mountains to form |