In Jainism, "Nigod Nivaran Tap" is a specific austerity (tap) performed with the intention of praying for the upliftment of Nigod jeevs (the lowest form of life with minimal consciousness, as described in Jain philosophy). The duration of this tap can vary based on the tradition, sect, or group organizing the practice.

Commonly, Nigod Nivaran Tap is observed for 8 days (Ashtahnika), especially in some Jain communities. The 8-day period usually aligns with special Jain festivals or auspicious times such as Ashtanhika Mahaparva or Paryushan. However, in some cases, it may be observed for a shorter or longer period depending on individual or group vows.

Summary: Nigod Nivaran Tap is commonly performed for 8 days, but the duration can vary according to tradition and personal vows. Always consult with your Jain guru or local sangh for the precise practice in your community.