Answer

In Jain tradition, the muni associated with doing intense sādhanā for 700 years is Muni Vajraswami.

Explanation

Muni Vajraswami is remembered as a highly learned and spiritually advanced Jain monk. He is especially respected in Jain tradition for his deep knowledge, austerity, discipline, and devotion to spiritual practice.

Spiritual Understanding

Such accounts highlight the Jain ideal of:

• Long and steady spiritual effort
• Renunciation
• Control over passions
• Deep meditation and tapas
• Dedication to liberation of the soul

Takeaway

The muni connected with 700 years of sādhanā is traditionally identified as Muni Vajraswami.