Answer

If you are using the common Jain way of counting porsi from sunrise to sunset, then:

• Sunrise: 7:15 AM
• Sunset: 5:55 PM

Total daylight = 10 hours 40 minutes = 640 minutes

So:

• 1 porsi = 1/8 of daylight
• Dedh porsi = 1.5 porsi
• Do porsi = 2 porsi
• Tin porsi = 3 porsi

Calculation

Step 1: Divide daylight by 8

So:

• 1 porsi = 80 minutes = 1 hour 20 minutes

Step 2: Calculate each one

• Dedh porsi = 1.5 × 80 = 120 minutes = 2 hours
• Do porsi = 2 × 80 = 160 minutes = 2 hours 40 minutes
• Tin porsi = 3 × 80 = 240 minutes = 4 hours

Time from sunrise

Starting from 7:15 AM:

• 1 porsi ends at 8:35 AM
• Dedh porsi ends at 9:15 AM
• Do porsi ends at 9:55 AM
• Tin porsi ends at 11:15 AM

Explanation

This is the usual method:

1. Take the time from sunrise to sunset
2. Divide it into 8 equal parts
3. Count porsi from sunrise

So in your example, one porsi is 1 hour 20 minutes.

Takeaway

For 7:15 AM sunrise and 5:55 PM sunset:

• Porsi = 8:35 AM
• Dedh porsi = 9:15 AM
• Do porsi = 9:55 AM
• Tin porsi = 11:15 AM

If you want, I can also show you a simple formula/table you can use for any sunrise and sunset time.