What does normalized mean in this context?

[find_the_fun]

In a paper I'm reading the author keeps using the word "normalized". What does it mean?

We use playback interruption time as our main metric.
However, since the viewed length by a user varies widely,
instead of just measuring total interruption time of each view,
we normalize it by the viewed length, which we call the
normalized interruption time (NIT).
​

Does it mean dividing the sum of the interuptions by the sum of the non-interrupted times? Or diving it by the total time thus far? Or dividing by the entire time of the video?

 

[phymat]

It means diving each viewed length by the original duration of the video.
However, you must tell about the exact origin of this paragraph.

 

[find_the_fun]

It means diving each viewed length by the original duration of the video.
However, you must tell about the exact origin of this paragraph.

Dividing by the entire duration of the video or up to the point watched?

 

[Ackbach]

Dividing by the entire duration of the video or up to the point watched?

Usually it would mean dividing by the entire duration of the video.