Answer

Porsi in Jain practice usually means a Pachkhan of not taking food or water until about one prahar after sunrise, which is commonly understood as around 3 hours after sunrise. The exact timing can vary slightly by tradition and local sunrise calculations. ( websites.umich.edu)

Explanation

To take Porsi properly, the usual way is:

• Sit calmly and keep your mouth clean.
• Fold your hands with devotion.
• Recite the Navkar Mantra.
• Then take the Porsi Pachkhan from the proper wording used in your tradition, or from a Jain elder / guru if available.
• After taking it, do not eat or drink anything until the Porsi time is complete. ( jainknowledge.com)

A common practical understanding is that Porsi = three hours after sunrise, and some Jain communities calculate it as the end of the first prahar from sunrise. ( websites.umich.edu)

When the time is completed, many Jains first sit in one place, remember the Navkar Mantra, and then take food or water with a calm and disciplined mind. ( jainbliss.com)

Spiritual Understanding

In Jain Dharma, Porsi is a form of self-restraint and tapas. It helps reduce attachment to food, strengthens discipline, and supports the भावना of ahimsa, संयम, and inner purity. ( jainknowledge.com)

Takeaway

If you mean the Jain fasting vow, Porsi is generally taken after sunrise and kept until about 3 hours later. The most important things are proper timing, devotion, and following your own Jain tradition’s procedure. ( websites.umich.edu)