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One has to stay in the realms of hell and the like until the karmic consequences are exhausted. Only when the bound lifespan is exhausted, does one get liberation from that particular body.
**Ayukarma** (Lifespan Karma): It does not bring happiness or sorrow to the being, but it determines the duration for which the being remains in a particular body. _Narkajivas_ (beings in hell) are extremely miserable in the hellish realm. They would prefer to die rather than live there, but due to the existence of _Ayukarma_, their desire is not fulfilled as long as the _Ayukarma_ to be experienced remains. Similarly, humans and gods who have access to worldly pleasures and have a strong desire to live, are forced to depart to the next world when their _Ayukarma_ is exhausted. In other words, due to the existence of _Ayukarma_, a being cannot abandon its realm and gross body before its predetermined time and dies when it is exhausted, meaning it cannot remain in that gross body after the time is up. There are two types of _Ayukarma_: _Apvartaaniya_ (modifiable) and _Anpavartaniiya_ (unmodifiable).
_Apvartaaniya_ lifespan: The lifespan that is reduced due to external causes is called _Apvartaaniya_ lifespan or _Apvartya_ lifespan. This means that experiencing a lifespan bound for fifty years or more in a moment due to external causes like drowning, weapon injury, poison consumption, etc., is the modification of lifespan. This lifespan is also called untimely death by the common people.
_Anpavartaniiya_ lifespan: The lifespan that cannot be reduced by any cause. It is experienced for the duration for which it is bound, and is called _Anpavartaniiya_ or _Anpavartya_ lifespan.
Those who are born in the realms of hell and gods, _Charma Shariri_ (those who are destined for liberation from that body), and the best of men, ...