From Neminath Bhagwan’s main temple (Neminath tonk) to Sahasavan (Neminath Bhagwan’s Diksha / Keval‑jnan kalyanak bhumi), you should expect about 1,300–1,500 steps one way.

Different guides and yatris count slightly differently (and routes can vary a little), but in Jain yatra descriptions of Girnar, this stretch is generally described as around fifteen hundred stairs between the Neminath area (Gaumukh–side path) and Sahasavan.

You can read more about Girnar and Sahasavan on this detailed tirth page