A standard Pind Daan ritual for ancestors, performed properly by a knowledgeable Pandit here in Prayagraj, might typically take around 1 to 2 hours. This includes the initial sankalpa, purification, invocation, offering of the pinds with mantras, prayers, and the final immersion (visarjan) at the Sangam. If combined with other rituals like a more elaborate Shraddha or special rites like Tripindi Shraddha at Prayagraj, it could take longer. Factor in time for bathing at the Sangam before the ritual and potentially giving daan afterwards when planning your visit to Prayagraj.