Answer

In Jain practice, boiled water is generally used within 24 hours after boiling.

During Paryushan and the monsoon period, many Jains are especially careful and follow this discipline strictly.

Explanation

The purpose of boiling water is to reduce harm to tiny living beings in water. After boiling, water is kept covered and used within a limited time because over time living organisms may again develop in it.

Common Jain household practice:

• Boiled water: used within about 24 hours
• After 24 hours: it is usually not considered proper to drink for religious observance
• During Paryushan / Chaturmas: people often become more careful and may boil fresh water daily

Spiritual Understanding

This practice is connected with Ahimsa — minimizing harm to even the smallest forms of life. In Paryushan especially, Jains try to increase awareness, restraint, and purity in food and drink.

Takeaway

For Paryushan or monsoon observance, it is safest to drink boiled and cooled water within 24 hours, kept properly covered.