Quick question on Track Reports

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It's probably somewhere in front of me in the manuals but for whatever reason I just don't see it. I am looking at Track Logs and wondering what exactly are the following?:

Duration - (is this track length in seconds, or length for entire month (i.e. cumulative total in seconds from each time played?)

Frequency  - (is this how many times the song was played during the month?)

Performances -  (is this the number of listeners for the song for the entire month?)

Thanks in advance for the clarification.
Duration is the length of the track, in seconds.

Frequency is the number of times it was played.

Performances is the number of times it was heard by a distinct listener.

If a track was played once but nobody heard it, frequency=1 but performances=0. If a track was played once and 3 people heard it then frequency=1 but performances=3.
Thank you, Alexiu!