THE JAIN FESTIVAL PARYUSHAN PARVA LASTS 8-10 DAYS. Aside from Diwali, one of the most important celebrations in the Jain religion is Paryushan Parva. In fact, the celebration is so vital that Jainism is tantamount and otherwise termed as Paryushan because the festival embodies the core principles and objectives of the religion. There are minor differences in observances among the various Jain communities and sects around the world but all focuses on spiritual upliftment, self purification, deeper understanding of religion and the pursuit of salvation.

Source: Jains Observe Paryushan Parva with Fasting and Meditation - World Religion News