Answer

In Jain practice, boiled water should generally be consumed within 24 hours after boiling.

After that, it is traditionally avoided because microorganisms may begin to develop again.

Explanation

In Jain Dharma, boiling water is done to reduce harm to living beings in water. Once water is boiled and cooled, it should be kept covered and clean.

Common Jain practice:

• Boiled water: consume within 24 hours
• Keep it covered: to avoid contamination
• Do not mix old and new boiled water
• Avoid drinking after sunset where that discipline is followed

Spiritual Understanding

The purpose is not only health, but also ahimsa — reducing harm to subtle living beings as much as possible.

Takeaway

For Jain practice, drink boiled water within 24 hours, keep it covered, and prepare fresh boiled water daily.