As discussed in the last post, I suggest the shortest scene (19) 0.02 secs is The Midpoint.

This scene is a series of flashing stills as apparently time stands still – a phenomenon thought to represent alien abduction.

In this scene Scully and Mulder are caught in the same brilliant, flashing, bright light we see in scene 1 in the forest and see again in the climax.

So, perhaps this is further evidence that the light punctuates the structure. We see the bright light in Act 1 at The Midpoint and in The Climax.