Answer

During Chaturmas / Chaumasa, boiled water is generally considered usable only for a limited time, depending on the Jain tradition and local practice.

A commonly followed rule is:

• Boiled water should be used within the prescribed “kal” period.
• After that time, it is usually not considered proper for drinking in strict Jain practice.

However, the exact kal of boiled water can vary by tradition, sect, climate, and guidance of one’s Guru or Sangh.

Explanation

In Jain Dharma, especially during Chaumasa, great care is taken regarding water because water may contain subtle living beings. Boiling water is practiced to reduce harm to such beings and to follow greater discipline in food and drink.

The concept of kal means the permitted time limit within which boiled water may be used. Once that time passes, strict followers avoid using it and boil fresh water again.

Spiritual Understanding

The purpose is not only physical cleanliness, but mainly:

• Ahimsa — minimizing harm to living beings
• Jagruti — awareness in daily consumption
• Sanyam — discipline during Chaumasa

Takeaway

For the exact kal followed in your tradition during Chaumasa, it is best to ask your Guru Bhagwant, Sadharmic elder, or local Sangh, because the rule may differ in practice.