Buddha Abhidhamma - Ultimate Science - BuddhaNet

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Again, Mallika, the queen of King Kosala, had to
suffer in a woeful state only for seven days due to an
immoral deed, and then she was reborn in the sensuous
blissful plane for her good deed. On the other hand,
Devadatta is destined to suffer for an aeon in niraya for
his serious bad kamma of causing a schism in the Order
of Brotherhood.
2 The human beings also do not have fixed life-span; the
age-limit rises from ten years to uncountable years
(asaïkheyya) and then falls to ten years again.
The interim period, when the age-limit of human
beings rises from ten uncountable years and then falls
to ten again, is known as an antara-kappa. In other words,
an antara-kappa is measured by the time required by
the pendulum of the life-term of generations to swing
from a ten-year-term to an asaïkheyya-term and back
again to the ten-year-term.
Sixty-four such antara-kappas equal one asaïkheyyakappa,
literally an incalculable cycle. An asaïkheyya-kappa
exceeds the time required to exhaust a big box a yojana
each in length, breadth, and height, filled with mustard
seeds, by throwing away a seed once in every hundred
years. An asaïkheyya-kappa may be taken as an aeon.
Four asaïkheyya-kappas equal one mahà-kappa,
literally a great cycle. One mahà-kappa is also known as
a world-cycle.
3 The earth-bound deities and degraded asuras both