Answer

There is no single strict Jain rule that says a home mandir diya must burn for a fixed number of hours.

In practice, it is usually kept burning:

• during darshan and puja
• for some peaceful time in the morning or evening
• as long as it can be maintained safely and respectfully

Explanation

In Jain tradition, the diya represents light, awareness, purity, and devotion. So the main intention is bhakti and reverence, not how long it burns.

A good practical approach is:

• Light it when you do darshan or puja
• Keep it burning while you are at home and can attend it
• Extinguish it safely before sleeping or leaving the house
• Never let it burn in a way that creates danger

If your family has a traditional practice, it is good to follow that with devotion.

Spiritual Understanding

The diya is a reminder to keep the inner light of right faith, right knowledge, and right conduct awake.

So in Jain Dharma, the value is in:

• sincerity
• cleanliness
• non-negligence
• devotion without harm

A safely and respectfully maintained diya is better than one kept for long hours carelessly.

Takeaway

A home mandir diya should burn for as long as it can be kept safely and with devotion. There is no universal fixed duration in Jain practice.