Adinath (Rishabhanatha) is traditionally said to have lived for an extremely long period. The commonly cited total life span is 8,400,000 purva years. This is a tirthankar’s life span as described in Jain cosmology, not comparable to ordinary human years. Both major Jain traditions (Digambar and Shwetambar) recount such vast durations, though some texts present them using different time units. You can read more here