Answer

In Jain practice, boiled water should generally be consumed within the same day.

Traditionally:

• Boiled during the day: used only until sunset.
• Boiled after sunset: used only until the next sunrise.

After that, it is usually not consumed because subtle life forms may begin to develop again in the water.

Explanation

In Jain Dharma, water is boiled to reduce harm to living beings present in water. But boiled water does not remain free from new microscopic life indefinitely. Therefore, Jain discipline places a time limit on its use.

This practice is connected with ahimsa and carefulness in daily living.

Takeaway

For Jain observance, drink boiled water within the proper time limit: before sunset if boiled in daytime, and before sunrise if boiled at night.