In Jain cosmology, the time cycle (kalpa) is divided into two halves: Utsarpini (ascending/progressive) and Avasarpini (descending/degenerative). Each half is further split into six unequal periods called aras. So, “utsarpini” refers to the six periods of the ascending half and has very long durations.

Durations of the six aras in Utsarpini (ascending half):

• 1st ara: duṣamā-duṣamā — 21,000 years
• 2nd ara: duṣamā — 21,000 years
• 3rd ara: duṣamā-suṣamā — 1 crore of crore sāgaropama years
• 4th ara: suṣamā-duṣamā — 2 crore of crore sāgaropama years
• 5th ara: suṣamā — 3 crore of crore sāgaropama years
• 6th ara: suṣamā-suṣamā — 4 crore of crore sāgaropama years

A full cycle (utsarpini + avasarpini) is astronomically vast, with each half containing six aras of these lengths. The total length of Utsarpini alone is described as extremely large in the scriptures. For a compact summary of these divisions and durations, you can read a concise explanation here:

Note:

• The above durations are the traditional Jain counts found in canonical and later cosmology discussions.
• In Jaina and other Jain sources, the framework is the same across Digambar and Śvetāmbar traditions, though some texts may use slightly different phrasing for the aras. The essential idea—six aras in each half-cycle and the ascending (utsarpini) vs. descending (avasarpini) structure—remains consistent.