In Jainism, Paryushan is observed for 8 days (by Shvetambar Jains; Digambar Jains observe it for 10 days as Das Lakshana). The primary reason for the duration of 8 days is rooted in Jain tradition and scriptural guidance, rather than a specific historic event.

Scriptural Significance:

• The term "Paryushan" comes from "Pari" (all sides) + "Ushan" (to burn or destroy), meaning to burn or shed all karmas accumulated from all sides through spiritual practices.
• According to Jain Agamas (scriptures), these 8 days are considered highly auspicious for intense spiritual upliftment, self-purification, and seeking forgiveness (Kshamapana).
• During this period, Jains focus on the "eightfold path" of spiritual practices: Samyag Darshan (right faith), Samyag Jnana (right knowledge), Samyag Charitra (right conduct), Tap (austerity), Vairagya (detachment), Shila (discipline), Pratikraman (reflection/repentance), and Kshama (forgiveness).

No Specific Historical Event:

• There is no single historic event tied to the choice of 8 days. Rather, it aligns with the monsoon season (Chaturmas), when Jain monks stay in one place and engage in deeper spiritual practices and scriptural study, making it an ideal period for laypeople to also intensify their sadhana.
• The 8 days allow for a comprehensive practice of spiritual disciplines, culminating in Samvatsari, the Great Day of Forgiveness.

In summary, the 8-day duration of Paryushan is based on scriptural tradition and its suitability for concentrated spiritual effort, not a particular historic event.