Answer

In Jain cosmology, the First Ara of Avasarpiṇī Kāl is called Sukhamā-Sukhamā Ara.

Its duration is traditionally described as:

4 Koḍākoḍī Sāgaropam years.

Explanation

Jain time cycle has two halves:

• Utsarpiṇī Kāl – ascending time cycle
• Avasarpiṇī Kāl – descending time cycle

Each half has six Aras. The First Ara of Avasarpiṇī is a period of extreme happiness, purity, long life, and minimal suffering.

Takeaway

So, the First Ara of Avasarpiṇī Kāl lasts for 4 Koḍākoḍī Sāgaropam years, an unimaginably vast measure of time in Jain Dharma.