Using Anki for a 72-hour cram session is kind of missing the point though. For me, the main benefit of Anki is to escape the cram->forget cycle and learn things low-stress and for good.

I 100% agree that is the optimal way. But it can be useful to memorize 300 questions and answers in 72 hours if you have to.

Word of caution to other readers: Don't use Anki for cramming. Especially not if you didn't learn and understand the material before cramming.

Could you explain why that might not be a good thing to do, siva7?

I've used anki for over a decade and done that mistake several times. Anki is designed to reinforce knowledge you've already learned, not to introduce new information. The cards shown in a SRS alogrithm don't follow an order which makes it suited from a pedagogic POV for acquiring new knowledge. Cramming tends to be done when knowledge hasn't been yet learned or understood sufficiently.