Is enlightenment gradual or instantaneous?

The following excerpt is from a samvaad (dialogue) session with Acharya Prashant.

Question (Q): Acharya Ji, we have heard many stories of kings getting enlightened in one moment. So, is enlightenment gradual or instantaneous?

Acharya Prashant (AP): It’s like a jigsaw puzzle. (Pointing at the arrangement of posters on the wall) Do you see this arrangement there? Let us say that this is the arrangement that is called ‘completeness’ or ‘totality’. Nothing is missing here, right?

Now, in the king’s life, this particular poster is missing. (Reading out the quotation written on the poster) “As you minimize the role of planning in your life, your freedom increases.” So one day this poster comes floating upon the wings and somehow gets fixed here on the wall. And now, the pattern is complete. Now the thing is total.

This is the way it becomes total for the king, because in the king’s story, in the king’s life only ‘this’ is missing. ‘This’ has no special relevance, except that in the king’s particular, personal story, ‘this’ was missing. Therefore, the appearance of ‘this’ thing has no special relevance for you.

You find out what is missing in ‘your’ life.

The king saw a dry, yellow leaf floating upon the winds, and he was immediately enlightened. That…