Answer

Yes — the calculation you quoted is mixed up. In the commonly used Jain timings, 48 minutes after sunrise is Navkarsi, not Porsi. Jain practice sources list Porsi as one prahar after sunrise, with Sadh Porsi as 1.5 prahar, Purimuddh as 2 prahar, and Avaddh as 3 prahar. One prahar is calculated as one-fourth of the daytime, so the exact clock time changes with local sunrise and sunset. ( jainuniversity.org)

Explanation

A corrected practical list is:

• Navkarsi — 48 minutes after sunrise. ( jainuniversity.org)
• Porsi — 1 prahar after sunrise. ( jainuniversity.org)
• Sadh Porsi — 1.5 prahar after sunrise. ( jainuniversity.org)
• Purimuddh — 2 prahar after sunrise. ( jainuniversity.org)
• Avaddh — 3 prahar after sunrise. ( jainuniversity.org)

So the statement “Porsi = 48 minutes” is incorrect; that timing belongs to Navkarsi. Some Jain guides also give approximate civil-time equivalents like Porsi = 3 hours, Sadh Porsi = 4.5 hours, Purimuddh = 6 hours, and Avaddh = 8 hours, but the prahar-based method is the more traditional way to understand it. ( jainworld.jainworld.com)

Spiritual Understanding

These timings help a Jain śrāvak or śrāvikā maintain discipline, restraint, and awareness in daily life. The purpose is not just timing food, but supporting ahimsa, self-control, and purity of conduct. ( jainuniversity.org)

Takeaway

Your table should be corrected like this:

• Navkarsi = 48 minutes
• Porsi = 1 prahar
• Sadh Porsi = 1.5 prahar
• Purimuddh = 2 prahar
• Avaddh = 3 prahar ( jainuniversity.org)

If you want, I can also format this into a clean Jain panchkhan-style reference table.