A terasecond (symbol:  Ts) is one trillion seconds. That is about 31,700 years. It can be written as 1012 seconds.

Here is a list of time spans longer than 1 terasecond:
 1015 seconds = 1 petasecond = 31.7 million years
 1018 seconds = 1 exasecond = 31.7 billion years
 1021 seconds = 1 zettasecond = 31.7 trillion years
 1024 seconds = 1 yottasecond = 31.7 quadrillion years
 1027 seconds = 1 xennasecond = 31.7 quintillion years
 1030 seconds = 1 dakasecond = 31.7 sextillion years
 1033 seconds = 1 hendasecond = 31.7 septillion years
 1036 seconds = 1 dokasecond = 31.7 octillion years
 1039 seconds = 1 tradakasecond = 31.7 nonillion years
 1042 seconds = 1 tedakasecond = 31.7 decillion years
 1045 seconds = 1 pedakasecond = 31.7 undecillion years
 1048 seconds = 1 exdakasecond = 31.7 duodecillion years
 1051 seconds = 1 zedakasecond = 31.7 tredecillion years
 1054 seconds = 1 yodakasecond = 31.7 quattuordecillion years
 1057 seconds = 1 nedakasecond = 31.7 quindecillion years
 1060 seconds = 1 ikasecond = 31.7 sexdecillion years

Teraseconds 
Here are some examples of events that take this long:
 75,000 years — time since the ancestors of the Indigenous Australians reached Australia
 76,000 years — half-life of nickel-59
 154,000 years — half-life of neptunium-236
 159,200 years — half-life of uranium-233
 200,000 years — age of Homo sapiens
 211,100 years — half-life of technetium-99
 250,000 years — age of Homo neanderthalensis
 301,000 years — half-life of chlorine-36
 340,000 years -- half-life of curium-248
 379 000 years -- time after the Big Bang until cosmic microwave background radiation began
 ~700,000 years -- time since the earth's magnetic field last changed
 1,000,000 years -- the lifespan of a blue supergiant star
 1,530,000 years -- half-life of zirconium-93
 2,600,000 years -- amount of time the Paleolithic era lasted
 2,600,000 years -- half-life of technetium-97
 3.74 million years -- half-life of manganese-53
 4 million years -- time since the last ice age
 4.2 million years -- half-life of technetium-98 
 6.5 million years  -- half-life of palladium-107
 15.6 million years -- half-life of curium-247
 20 million years -- time since the first forms of grass appeared
 23.42 million years -- half-life of uranium-236
 26 million years -- time since the first elephants were born

Petaseconds 
 34 million years -- time since the evolution of the cat
 34.7 million years -- half-life of niobium-92
 49 million years -- time since the whales returned to the water
 60 million years -- time since the evolution of the first primates.
 135 million years -- time since end of Jurassic and beginning of Cretaceous period
 250 million years -- Galactic year - an orbit around the center of the Milky way of our Sun and the Solar system
 251.4 million years -- time since the Permian mass extinction
 280 million years -- time since end of Carboniferous and beginning of Permian Period.
 390 million years - first fishapods
 575 million years -  age of the oldest animal fossils
 580 million years - time since the end of a possible Snowball Earth ice age
 703.8 million years - half-life of uranium-235
 750 million years - time since the beginning of a possible ice age
 1277 million years - half-life of potassium-40
 1.8-2.1 billion years - age of the earliest eukaryotes
 2.3 billion years - time since the first known ice age
 3.5 to 3.8 billion years  -  age of oldest records of life: stromatolites and  cyanobacteria 
 4.468 billion years  -  half-life of uranium-238
 4.5 billion years  -  age of the Earth
 13.7 ± 0.2 billion years (4e17 seconds)  -  age of the universe according to the Big Bang theory
 20 billion years  -  time until the end of the universe in the Big Rip scenario

Exaseconds 
 100 billion (1011) years -- If the universe is closed, the lifetime of the universe
 Some radioisotopes have very long half-lives:
 (1.4 ± 0.4) × 1017 years – vanadium-50
 (1.9 ± 0.2) × 1019 years – bismuth-209
 (3.1 ± 0.4) × 1019 years – cadmium-116
 (2.2 ± 0.3) × 1024 years – tellurium-128

Orders of magnitude
Units of time