In Jainism, breaking a fast (known as Parna or Parna Vidhi) is an important ritual observed with care and devotion. Here are the key guidelines and timing considerations:

1. Timing of Parna:

- Parna is usually done after sunrise on the day when the fast is to be broken. - Traditionally, it should be performed within 48 minutes (one muhurta) after sunrise. - Exact timing can vary depending on the specific fast and local customs, but breaking the fast before sunrise is not encouraged.

1. Procedure:

- Before breaking the fast, Jains often recite prayers or perform Samayik (meditation). - The first food or water taken to break the fast is ideally given by a fellow Jain or a respected elder, often called Parna Karvanu. - The first intake is usually boiled water, followed by simple, easily digestible food.

1. Special Days:

- For major fasts like Paryushan, Ayambil Oli, or Paryushan Parva, the community may have specific timings announced by the temple or Jain Sangh.

1. Intention and Mindfulness:

- It is important to break the fast with the right intention, gratitude, and mindfulness, reflecting on the spiritual benefits gained.

Important Note: Always consult your local Jain temple or spiritual leader for the precise timing and rituals, as customs may slightly vary among different Jain sects (Shwetambar, Digambar, etc.) and regions.

Summary: Jain fast should be broken after sunrise, ideally within 48 minutes (one muhurta), and in accordance with local tradition and under the guidance of elders or spiritual leaders.