rahul 3 faces per photo means 300 000 faces to go through, which is a nightmare.
I guess you mean manual process when you click on each face. This list does not depend on amount of images, it will show you only best mathces. when you right click on the face.
What I am talking about it automatic suggestions for person. Accepting batches of 20-30 faces is definitly much more efficient than 2-3, let alone manually assigning each face. We suggest manual review as the final stage, when you already finished with the automatic suggestions more or less, only as a way to find what program has missed. This should save you a lot of work.
Have you seen our video on YouTube channel? It explains how we think the process should look like.