In Jainism, Ayushya refers to the lifespan of a soul in its current existence, determined by the Ayushya Karma (life-span determining karma). When considering Ayushya in Devlok (the heavenly realms), Jain scriptures provide detailed descriptions:

1. Devlok (Heavenly Abodes):

Souls who accumulate sufficient punya (meritorious karma) may be reborn as devas (celestial beings) in one of the heavenly realms. There are multiple levels of Devlok, including Saudharma, Ishana, Sanatkumara, Mahendra, Brahma, and others, up to the highest heavens called Anuttara Viman.

1. Ayushya in Devlok:

The lifespan (Ayushya) of devas is fixed and vastly longer than human lifespans. According to Jain texts such as the Tattvartha Sutra and commentaries like Gommatsara, the minimum lifespan in the lower heavens is 10,000 years, and it increases exponentially in higher realms, reaching up to multiple sagaropama years (an almost unfathomably long period).

- Example: In the first heaven (Saudharma), the minimum Ayushya is 10,000 years of the heavenly count (which itself is much longer than years on earth). - In higher heavens, Ayushya can be "palyopama" or "sagaropama" years (where one palyopama is an astral unit of time, much longer than trillions of human years).

1. Nature of Ayushya Karma in Devlok:

Once Ayushya karma for Devlok is determined at the time of rebirth, it cannot be shortened or extended. The soul must reside in that realm for the entire duration of its Ayushya karma before transmigrating to another realm after death.

1. Significance:

Although life in Devlok is full of pleasures, Jainism teaches that even heavenly life is transient and not a means to liberation (moksha). Devas, after exhausting their Ayushya, can be reborn in any other realm—including human, animal, or even hellish existences—depending on their accumulated karma.

References:

• Tattvartha Sutra (Tatvarthadhigam Sutra) – Chapter 3 (Bondage of Karma)
• Gommatsara Jivakanda
• Jain Cosmology texts

If you have a specific Devlok or Ayushya calculation in mind, please specify for more precise details!