1 E15 s

To help compare orders of magnitude of different times this page lists times between 10¹⁵ seconds (a "petasecond") and 10¹⁶ seconds (32 million years and 320 million years) "See also" times of other orders of magnitude.

* Shorter times
* 34 million years -- time since the evolution of the cat.
* 34.7 million years -- half-life of niobium-92
* 36 million years -- time since end of Eocene Epoch and beginning of Oligocene Epoch; age of the "Cercopithecidae" (Old World primates) superfamily.
* 40 million years -- estimated period of time until Australia will collide with Asia; time since the age of the "Catarrhini" parvorder. Time since the evolution of the first canines.
* 49 million years -- time since the whales returned to the water.
* 60 million years -- time since the evolution of the first primates.
* 65 million years -- time since Cretaceous-Tertiary extinction event at end of Cretaceous Period (end of Mesozoic Era) and beginning of Tertiary Period (beginning of Cenozoic Era). Cretaceous mass extinction; end of the age of the dinosaurs.
* 135 million years -- time since end of Jurassic and beginning of Cretaceous Period.
* 195 million years -- time since end of Triassic and beginning of Jurassic Period; time since the appearance of the earliest mammals.
* 250 million years -- Galactic year - a revolution around the center of the Milky way of our Sun and the Solar system.
* 251.4 million years -- time since the Permian mass extinction. End of Permian Period and of the Palaeozoic Era. Beginning of Triassic Period, the Mesozoic era and of the age of the dinosaurs.
* 280 million years -- time since end of Carboniferous and beginning of Permian Period.
* Longer times