• A billion years, geologically
• A dog's age
• A lo-o-o-ong time
• A long long long time
• A long long time
• A long time
• A long time to wait
• A lot of time
• A really long time
• A seeming eternity
• A very long time
• Ages
• Ages and ages
• Ages and ages (or what 57 feels like)
• Ages and ages and ages
• Ages and ages and...
• Ages galore
• Ages on end
• Ages upon ages
• Almost an eternity
• Almost eternities
• Almost eternity
• Almost forever
• An eternity
• An eternity, seemingly
• An extremely long time
• Archean and Proterozoic
• Asimov's 'Counting the ___'
• Astronomical figures
• Astronomical periods
• Astronomical time periods
• Astronomical units of time
• At least two billion years
• Awfully long time
• Big times
• Billion-year increments
• Billion-year increments, in geology
• Billion-year periods
• Billion-year stretches
• Billions and billions of years
• Billions of years
• Billions of years, geologically
• Centuries of centuries
• Chronological slabs
• Cosmic cycles
• Cosmic times
• Countless ages
• Countless centuries
• Countless years
• Cryptozoic and Phanerozoic
• Donkey's years
• Earth's age, perhaps
• Endless time
• Eras upon eras
• Eternities
• Eternities, almost
• Eternities, seemingly
• Eternity
• Eternity, seemingly
• Evolutionary time periods
• Extensive periods
• Extra-long durations
• Extremely long stretches
• Extremely long time
• Extremely long time frames
• Extremely long time periods
• For-EV-er
• Forever and a day
• Forever and ever
• Forever, figuratively
• Forever, it seems
• Forever, seemingly
• Forever, so to speak
• From here to eternity
• Gazillions of years
• Geologic divisions
• Geologic periods
• Geologic procession
• Geologic span
• Geologic stretches
• Geologic time divisions
• Geologic time periods
• Geologic time spans
• Geological spans
• Geologists' periods
• Geologists' times
• Gobs of time
• Great spans
• Great times
• Hadean and Archean, for two
• How long it takes canyons to form
• How long it takes mountains to form
• Huge spans
• Huge timespan
• Hundreds of centuries
• Immeasurable periods
• Immeasurable time
• Immeasurably long periods of time
• Important times
• Incalculable amount of time
• Incredibly long times
• Indefinitely long periods of time
• Indefinitely long time periods
• Infinite time
• Infinity almost
• Interminable length of time
• Interminable times
• Just about forever
• L-o-n-g times
• Largest divisions of geologic time, comprising two or more eras
• Lengthy time units
• Lengthy units of time
• Lo-o-ong time
• Long geologic stretches
• Long long time
• Long periods
• Long periods of time
• Long periods, geologically
• Long spans
• Long stretch
• Long time periods
• Long times passing
• Long times to wait
• Long, long periods
• Long, long time periods
• Long, long time spans
• Long, long, long time
• Looooong times
• Major stretches
• Major time periods
• Mammoth time units
• Mammoth units
• Many ages
• Many eras
• Many lifetimes
• Many many centuries
• Many millenia
• Many millenniums
• Many moons
• Many years
• Many, many millennia
• Many, many minutes
• Many, many moons
• Many, many years
• Many, many, many moons
• Millennia
• Millennia upon millennia
• Mind-boggling time spans
• Multi-era spans
• Multiple millennia
• Near-eternity
• Near-infinite timespans
• Nearly forever
• Nigh-infinite periods
• Paleontological spans
• Plenty of time
• Practically forever
• Quite a while
• Really long time
• Roughly forever
• Scads of time
• Seeming eternity
• Seemingly endless time periods
• Seemingly forever
• Several thousand million years
• Slow-to-pass spells
• Some collars and jackets
• Spans of history
• Stellar periods
• Stretch of history
• Tech support wait time, typically
• They last a long time
• They seem to last forever
• Thousands and thousands of years
• Thousands of centuries
• Thousands of years
• Time and time again
• Time beyond measure
• Time divisions
• Time immemorial
• Time it seemingly takes when one's waiting in line
• Time on end
• Time out of mind
• Time periods
• Time to evolve?
• Time, seemingly, between finishing a freelance job and getting paid
• Timeless times
• Twelfth of never?
• Unfathomable stretches
• Unimaginably long stretches
• Units of geologic time
• Units of time
• Units on the geologic time scale
• Untold centuries
• Vast spans
• Vast stretches of time
• Vast sweep of time
• Very long periods
• Very long spans
• Very long spell
• Very long stretches
• Very long time
• Who-knows-how-long
• Years and years
• Years and years and years
• Years and years and years and...
• Years on end
• Years untold
• Years upon years