“Pāṇī no kāl” (Gujarati) means the time‑limit related to water in Jain maryadā.

• What it means

- Time window to drink water: Only in daylight (after sunrise and before sunset). No water at night (Chauvihār). - Time for boiled water to remain usable: After boiling and filtering, water is kept only for a limited period; after that “kāl” ends and it should not be used.

• Why this rule

- To minimize hiṁsā toward water‑bodied beings (āp‑kāy jīv) that arise especially at night or in stored water. - For discipline and health.

• Common practice (simple)

- Drink only boiled and properly filtered water in daytime. - Do not drink any water after sunset until next sunrise. - Boiled water is used only within its “kāl” as guided by your ācārya-sampradāy; when the time finishes, prepare fresh.

• Tradition notes

- Śvetāmbara and Digambara: Both uphold no water after sunset. Exact hours for how long boiled water remains valid can differ by maryadā; follow your guru-paramparā.

For short, practical guidance:

• Ukālelā pāṇī (boiled water) has a limited “kāl” of usability; keep it covered, use within your tradition’s set hours, then discard and make fresh.
• Nighttime = no water.

Helpful references:

• Ukalelā pāṇī no kāl
• Chauvihār (no water after sunset) timing
• Paryushan daytime water rule