[...oh, honey.]

I...don't honestly think there is a base minimum. Say that you were to help one individual bear whatever suffering they might feel; it's true that the impact upon the world at large is as a drop in the ocean. Yet does it become meaningless simply because it does not end suffering as a concept?

I should think that to extend a hand to even a single person in need of it would change their own world considerably. That in itself is 'good enough' by my standards.