Which Catholic theologians say that Purgatory is a "fiery moment"?

I was watching a video interview of NT Wright about life after death, in which he makes a statement that: > Some Roman Catholic theologians now say that that's actually what Purgatory is actually about. That fiery moment when everything we've done which is not of God and which is not Kingdom Building is just going to be burned up. And they will say that's in a flash. It isn't years and years which you can quantify and get time off for good behavior or whatever. [Rethinking Life After Death (NT Wright) -- 22:30](http://www.youtube.com/watch?v=rZC6tbgpsl4&t=22m30s) To which Catholic theologians is he referring, whom hold a view, or express the possibility, that purgatory is instantaneous/momentous, as opposed to a long "process"? Where can I read more about this concept?