- EON
- Extremely long time
- The Hadean one began 4.6 billion years ago
- A billion years
- A lo-o-ong time
- Age
- Ages and ages
- Eternity
- Indefinitely long time
- Long, long time
- A month of Sundays
- Many eras
- One billion years in ONE?
- Roughly forever
- Big time
- Long time
- Quite a while
- Big stretch
- 1 billion years
- Long, long, long time
- Seemingly forever
- Very, very long time
- Basically forever
- Really long spell
- Super-freaking-long time
- Time spent at the DMV, it often seems
- Hundreds of generations
- Really, really long time
- Long long long long long long long time
- Many ages
- Astronomical period
- Longest division of geological time
- Duration of a red light when you're in a hurry, seemingly
- Long stretch of time in geology, or at the DMV
- Quite a stretch
- Seemingly endless stretch
- Amount of time my wife once waited in line at the DMV, literally from the Proterozoic age until the Archean
- Long period
- Span that can't be measured
- The first was the Hadean (~4 billion years ago)
- Paleontological span
- Geological time
- Forever, seemingly
- Uncountable years
- Very long time
- Long stretch
- An eternity
- Anagram of 40-Across
- Big, big stretch of time
- Billion years, easily
- Hadean or Archean, e.g.
- It is a long, long, long time
- Phanerozoic, e.g.
- Phanerozoic, for instance
- This is going to take a while
- Time between checks, for a freelancer, seemingly
- Time between ice ages
- Time in between gigs, seemingly, to an impatient freelancer
- Time it takes for a cavern to form
- Time it takes for a mountain to form
- Time it takes for your four-year-old to finish her meal (seemingly)
- Time it takes to get to a human being when calling a call center, seemingly
- Time period
- Time spent calling call centers, seemingly
- Unfathomably long time
- Unthinkable length
- Wait for a bus on a rainy day?
- Wait time at the cashiers on Black Friday, seemingly
- Forever and ever
- Lengthy time
- From here to eternity
- Big chasm in geology
- Serious stretch
- Very rough duration for how long it takes a child to finish dinner, seemingly
- Eternity plus
- Geologist's division
- Eternity, seemingly
- It's been going on for who knows how long
- It's gonna take a while
- Forever and a day and then some
- Humongous timespan
- Countless years
- Years and years
- Big bunch of years
- Many millennia
- Good long while
- Really long time
- Tons of time
- Big hunk of time
- Forever and a day
- Big time division
- Immeasurable time
- Many a moon
- Giga-year
- Long time to wait
- Quite a span
- Lo-o-o-ong time
- Long time, geologically
- Geologic time division
- Two or more eras
- Vast time unit
- Proterozoic ___
- Immeasurable time unit
- Geologic time unit
- One billion years
- Unimaginable time
- Unimaginably long time
- Cosmological span
- Many moons
- Millions of years
- The Phanerozoic, for one
- Indefinitely long period
- Large timeline segment
- Largest division of geologic time
- Seeming eternity
- One of several in many a star's lifetime
- Saganesque period
- Scientific term often spelled with an "a" at the beginning
- Significant stretch
- Impatient people likely can't wait for one
- Stretch for quite a while
- One of four for 57-Across
- One of four in the history of the world
- Word from the Ancient Greek for "age"
- Chaotian _____ (proposed division covering time between formations of the Solar System and the Earth as we know it)
- 365 billion days, in astronomy
- Time spent on hold
- 1,000,000,000 years
- Geological period
- Long time between dates?
- Time spent on hold, e.g.
- Almost forever
- Awfully long time
- Forever and a day, seemingly
- Largest geologic time division
- One billion years, geologically
- Two or more eras, in geology
- Untold centuries
- Billion years
- Billion-year stretch
- Largest division of time, in geology
- One billion years, to an astronomer
- About 1/5th of Earth's existence
- Geological stretch
- Mighty long stretch
- Millennia upon millennia
- Unbelievably long time
- Geological span
- Inconceivable stretch
- A long, long time
- Ages
- Many, many moons
- Many, many years
- Long time, to a geologist
- Time immemorial
- Time on end
- A million millennia
- Almost nine trillion hours
- Immeasurable period of time
- Years on end
- Chiliad after chiliad
- Span of epoch proportions?
- Billion-year span
- Long geological period
- Centuries and centuries
- Million-millennia period
- Mind-boggling time span
- Myriad moons
- Period too long to measure
- Time on hold, seemingly
- Unimaginable time period
- Many millenniums
- Mighty long time
- Longest division of geologic time
- Ten megacenturies
- The longest time?
- Almost an eternity
- Almost eternity
- Many milleniums
- Ton of time
- Untold years
- It's a long time
- Just about forever
- Incalculably long time
- Incredibly long time
- It may seem like an eternity
- One billion years, in astronomy
- Dog's age
- Geologic span
- James Bond film production company
- Lengthy interval
- Series of periods
- <<NO CLUE>>
- Many 23-Across
- Multiple eras
- Long-ass time
- Looong time that's even looonger than 82-Down
- Suuuuuuuuuuper long time
- It's been in crosswords for "A long time"
- Long time, to put it mildly
- A l-o-n-g time
- Ostensible eternity
- ___ Productions (film company that's been producing James Bond movies for, appropriately, a very long time)
- Long time period
- Astronomically long time
- Eras and eras
- Thousands of centuries
- Time out of mind
- Month of Sundays
- Slice of history
- At least two eras
- Geologic period
- Vast period
- Countless amount of years
- Very long stretch
- A looooong time
- Considerable stretch
- Forever, facetiously
- Quite a spell
- A billion years, to Hubble
- Long time division
- Looooong time
- Real long spell
- Astronomical time period
- Lengthy stretch
- Long period of time
- Extensive period
- Great time
- Interminably long time
- Waiting period, it sometimes seems
- Annoying wait, facetiously
- Forever and a day, facetiously
- Very long interval
- About 525 trillion minutes, in astronomy
- Astronomical time span
- Quite a long time
- Two or more eras, in geologic time
- Long time, even in the singular
- Proterozoic, for one
- Billion-year period
- Era upon era
- It's quite a stretch
- Millions of lifetimes
- Length of a boring class, so it seems
- Frustrating waiting time, facetiously
- Geochronological span
- Scads of centuries
- Hard-to-imagine period
- Numerous centuries
- Quite a long while
- Big chunk of time
- Extended period
- Long while
- Really big stretch
- Very long spell
- Waiting time at the DMV, seemingly
- Big stretch of time
- L-o-o-n-g time
- Quite some time
- DMV wait time, seemingly
- Geological time span
- Hyperbolic wait time
- Long division?
- Long time span
- Long time to wait, facetiously
- Word that's sometimes an exaggeration
- A billion years, in geology
- Geologic time
- Loads of lifetimes
- Dog's age, so to speak
- Countless lifetimes
- Geologist's unit
- Proterozoic or Hadean
- Forever, figuratively
- Proterozoic, e.g.
- Unit of time often used hyperbolically
- Time without end
- Zillions of years
- Geologic division
- Vast stretch of time
- Mind-boggling span
- Mind-boggling stretch
- Very long time period
- Prolonged period
- It's longer than an era
- Long stretch of time
- It takes forever
- Lunch ending
- Huge time span
- Quasi-opposite of "flash"
- Many, many epochs
- Vast time period
- Very long span
- See 41 Down
- 1 billion years, in astronomy
- Billion years, in astronomy
- Long series of periods
- Extremely extended stretch
- Measure of geologic time
- Vast span
- A lot more than a minute
- Geologic time measure
- Very long period
- A real long time
- Geological time measure
- Exceedingly long time
- Extremely long period
- Hard-to-imagine interval
- Very long period of time
- Extremely long stretch
- Far beyond a millennium
- Historical period
- Much more than a minute
- It lasts and lasts
- Geologic time period
- The longest division of geologic time
- Archean, for one
- Immeasurably long time
- It's made up of many periods
- Lo-o-ong period
- Near eternity
- One million millennia
- Phanerozoic, for one
- Division of geologic time
- Half a million bimillennia
- It might be divided into eras
- It's over thirty quadrillion seconds long
- Millions of moons
- One hundred million decades
- Geologist's time period
- Huge stretch
- It can be subdivided into periods
- It lasts between four and five galactic years
- Seemingly endless time
- Vast time frame
- Astronomer's time period
- 10 megacenturies
- Umpteen millennia
- One million chiliads
- Progeny of Eternity and Infinity, in Marvel Comics
- Cycle.
- Diuturnity.
- Geological time division.
- The Paleozoic ___.
- Several eras.
- A very long time.
- An age of the universe.
- Geologic time span.
- Grand division of geological time.
- An age.
- Seemingly endless period of time.
- Time division.
- Years uncounted.
- Immeasurable years.
- Measureless time.
- Time uncounted.
- Immeasurable period.
- Many thousands of years.
- A million years.
- A thousand ages.
- From B. C. to TV.
- Unnumbered years.
- Unrecorded time.
- Relative of a millennium.
- Division of time.
- Time.
- Many years.
- Period akin to a blue moon.
- Time unlimited.
- Vast age.
- Cosmic cycle
- Relative of a saeculum
- Time span
- Geological age
- Period
- Span of time
- Century upon century
- Longest time division
- Geological division
- Infinite ages
- Eras upon eras
- Millennia
- Long, indefinite period
- Mind-boggling period
- Mind-boggling time
- The time of many billions of lives
- Millennium upon millennium
- Ages upon ages
- Many, many eras
- Periods upon periods
- Incomprehensible time span
- Two or more geological eras
- Countless ages
- Years upon years
- Lengthy period
- Long, long period
- Period from B.C. to TV
- Imprecise time unit
- Interminable time
- Long, long time period
- Kalpa, to a Hindu
- Geology interval
- How long it might take for a mountain to form
- Long run?
- Nearly forever
- Now we're in the Phanerozoic one
- S_c_ _d (time in time)
- Stretch of time
- Era after era
- Time unit
- Geology term
- Great time expanse
- Cosmological unit of time
- A dog's age
- Long spell
- Timepiece?
- Long, long ago
- Many lifetimes
- Waiting period, seemingly
- Unspecific duration
- One billion years, in geology
- Forever, or close to it
- Lots of time
- Clock watcher's wait, seemingly
- Generations
- Loooong wait
- Many chiliads
- Time in history
- No short time
- Period in the earth's history
- Super-long time
- Geologist's measure
- Time in a waiting room, seemingly
- Unit of time
- Group of eras
- What a waiting time may seem
- String of periods
- Waiting time at the motor vehicle bureau, seemingly
- It goes on and on
- It's a big stretch
- Span longer than an era
- Wait at the motor vehicle bureau, say
- Largest geological division
- Lot of time
- Period in history
- Years and years and years
- It keeps going and going ...
- Long interval
- Untold millennia
- Endless years
- It seemingly never ends
- It's a real stretch
- Unit in astronomy
- Astronomical stretch
- Impatient person's wait, seemingly
- The Hadean was the first one, ending about 4 billion years ago
- Many a doctor's office wait, seemingly
- 100,000,000 decades
- The Hadean was the earth's first one
- Countless centuries
- Gazillion years
- It's been a long time
- Word found in "time on end," appropriately
- Extended stretch
- Length of a long wait, in hyperbole
- Time it takes for paint to dry, seemingly
- Division in geology
- Lo-o-ong stretch
- Long span
- Phanerozoic ___ (current period in the earth's history)
- Series of ages
- The Phanerozoic, e.g., in geology
- Time between ordering and food arriving, seemingly
- -
- It's a stretch
- Length of time spent on hold, it often seems
- Section of geological history
- Stretch of history
- Lo-o-ong time
- Phanerozoic ___ (what we live in)
- Stretch longer than an 11-Down
- Time period, or an anagram of one?
- ___ Productions (company behind the James Bond films)
- One of four in Earth's history
- Over time period?
- Seemingly endless time span
- A bazillion jillion years
- Division of about one billion years
- About a billion years
- Myriads of moons
- Time to evolve?
- Centuries on end
- A frickin' long time
- Years and years on end
- Huge time stretch
- Lengthy time unit
- Countless years on end
- Megayears
- Millennia on end
- Practically forever
- Many, many millennia
- Umpteen years
- Long stretch of history
- Nearly an eternity
- Vast stretch
- Immense time span
- History unit
- Very long Supergrass song?
- Huge time unit
- For-ev-er
- Good long stretch
- Like for EV-ER
- Phanerozoic ___
- For-frickin'-ever
- Forever and a day, say
- Nice looong stretch
- 12,000,000,000 months
- Hyperbolic timespan
- Ages and ages and ages and ages
- A billion years, in astronomy
- Apparent eternity
- Really long period of time
- Seemingly eternal span of time
- Unit of geological time
- 365 billion days, astronomically
- Longest time span, geologically
- Period of many years
- Phanerozoic or Archean, e.g.
- A long period of time
- Geological duration
- Long geological time period
- Many centuries
- Geological time period
- Indefinite period
- Its make-up is many years
- Longish span
- Longish time span
- Longish span of time
- Proterozoic or Archeozoic, e.g.
- Long geological stretch
- Indefinable time period
- Long geological time
- Longest time
- Billion-year time period
- A billion years, to geologists
- An extremely long period of time
- Geologic-time measurement
- Really long geological time
- Great geological time span
- Long geologic time division
- Ages and ages, collectively
- Fathomless time
- Geological time unit
- Many millennia make one
- 365 billion days
- A thousand million years
- Extremely long time period
- Far too many years to count
- Thousands of years
- Vast geological time
- Incomprehensibly long time
- Long, long stretch
- Lots and lots of time
- One billion years, officially
- Endless time
- Lengthy time span
- Myriad coon's ages
- Perpetuity almost
- Indefinable time
- One billion years to Hubble
- Light years galore
- Geologic age
- Time measured in ages
- Amazingly long time
- It's comprised of ages and ages
- Geology period
- Immeasurably long period of time
- 1,000,000,000 years, in geology
- Humongous span
- One billion years, in geologic time
- Long, long, long time period
- Longest division of time, in geology
- Extremely long unit of time
- 365 billion days, geologically
- Long geological span
- Extended period of time
- Seemingly impossible time
- Extensive geological time
- Period of unspecified duration
- Seemingly endless span
- At least two geological eras
- It's quite a long time
- Period of a billion years
- The Phanerozoic, e.g.
- Vastly long time
- Very long stretch of time
- Period longer than a 12-Down
- Long unit of time
- Extra-long time period
- Seemingly endless amount of time
- Substantial period of time
- Very long timespan
- Wildly long time
- Long geologic span
- Long span of time
- Billion-year time span
- Extra-long time
- Major stretch of time
- Reaaaaally long time
- Unit of time equal to one million millennia
- Millenniums
- See 7 Down
- Many a DMV wait, seemingly
- Many periods are in it
- Immeasurable stretch
- Many, many lifetimes
- Period in the evolution of a planet
- Time it may take for a solar system to form
- Multimillennia period
- It'll take forever
- This'll take a while
- Heck of a long time
- Time it seemingly takes to get a tax refund
- We live in the Phanerozoic
- Awfully long stretch
- DMV wait, seemingly
- Interminable wait
- Long time stretch
- Last hour of the workday, seemingly
- Serious span
- 12-billion-month period
- Hadean, for example
- A hundred million decades
- Collection of eras
- Geologist's time unit
- Massive span
- Any of four in Earth's history
- Long wait time, seemingly
- Wait time at the DMV, seemingly
- Hugely long time
- Almost-endless stretch
- Forever and then some
- Hundreds of millions of years
- Overlong time
- Really long period
