In Jain cosmology, time is divided into vast cycles called "Kalachakras." One such cycle is known as a "Purna," which refers to a complete time-cycle, consisting of both Utsarpini (ascending half-cycle) and Avasarpini (descending half-cycle).

According to Jain scriptures, one Purna (complete cycle) consists of:

• Utsarpini (ascending half-cycle): 10 Koda Kodi Sagaropam years
• Avasarpini (descending half-cycle): 10 Koda Kodi Sagaropam years

So, one Purna equals 20 Koda Kodi Sagaropam years.

To clarify:

• 1 Sagaropam is an immensely large unit of time.
• 1 Koda Kodi Sagaropam means one crore crore (10^14) Sagaropam years.

Thus, a Purna is an almost inconceivably vast span of time, according to Jain cosmology.