Palyopam (palyopama) is a Jain time-measurement of enormous duration. It is used to indicate an almost unimaginable span of years in cosmology.

• Common understanding in Jain texts: 1 palyopam equals an extremely vast, essentially immeasurable period of time. Some traditional explanations describe it by a thought-experiment (e.g., filling a cube with lamb’s-wool strands taken every 100 years) to show vastness. In widely cited interpretations, it is treated as about 10^15 years, but the exact numeric value is symbolic and not fixed in modern calendars. ( jainknowledge.com, jainworld.jainworld.com)

• In the hierarchy of time scales, sagaropam is larger than palyopam, and both are used within the larger Kalchakra cycles (Utsarpini/Avasarpini). Digambar and Shwetambar traditions agree that sagaropam >> palyopam, but there are nuanced differences in phrasing rather than in the fundamental idea. ( jainknowledge.com)

If you’d like, I can point you to a JainKnowledge page that explains palyopam in more detail and how it fits into Jain cosmology.