In Jain cosmology, 1 palyopam (palyopama) is an extremely vast unit of time, not a precise modern-calendar number. It is traditionally explained as the time it would take to empty a huge pit filled with fine hairs, removing one hair every 100 years. Some modern summaries describe it as around 10¹⁵ years, but this is only an approximate way of expressing its immeasurable scale. ( jainknowledge.com)

So, the short answer is: one palyopam is unimaginably long, and its exact value is not fixed in ordinary years. ( jainknowledge.com)