Answer

In Jain practice, boiled water kaal is generally counted for one prahar, which is about 3 hours, after the water has been properly boiled and cooled.

After that time, traditionally it should not be used as “ukāḷelu pāṇī” for religious discipline.

Explanation

Boiling water is practiced to reduce harm to living beings in water. But after some time, new microorganisms may develop again, so its validity is limited.

A common Jain understanding is:

• Boiled water kaal: about 3 hours
• After 3 hours: it should be boiled again if one wishes to follow the discipline strictly

Some local traditions may follow slightly different timings, so if you are observing a specific vow, it is best to follow your family tradition or guidance from a learned Jain guru.

Takeaway

For daily Jain discipline, consider boiled water valid for around 3 hours after boiling.