For Mumbai on 26 April 2026, sunrise is about 6:14 am. So Porsi would be around 9:14 am if counted as 3 hours after sunrise. Some Jain traditions use 48 minutes after sunrise for Navkarshi, which would be about 7:02 am. ( timeanddate.com)

If you mean a specific Jain pachkhan tradition, the exact timing can differ slightly by sect and local panchang. ( jainknowledge.com)