For all we know there is a 1-2 interval in analogue as well, who is to say that film starts being exposed the instant light falls on it.
That is, when the shutter opens, right? I mean, we ARE assuming light travels at infinite speed, here, am I correct? Taking into account light speed seems to be a bit too much accuracy.
1-2 was referring to the moments immediately AFTER lights hits the surface of sensor/film, in case - just in case - sensor does not respond immediately with an electric signal or, similarly, chemical reaction on a film does not actually start.