A basic Pind Daan focusing mainly on Vishnupad and Phalgu might take 2-4 hours.
A more comprehensive Shraddh involving multiple vedis (like a 3-day or 5-vedi ritual) can take one full day or spread over 2-3 days, including travel between the sites within Gaya.
During the peak Pitru Paksha Mela in Gaya, due to crowds, even simpler rituals might take longer.
Discuss your time constraints with your Gayawal Panda beforehand so they can guide you on the appropriate type of Shraddh ceremony feasible for you in Gaya.
