How long a recording ran

The middle length of each year’s recordings, from the sound we hold.

The shortest year is 1940, at 2:32; the longest is 1962, at 3:21.

Source: measured audio for 3,724 of the 12,742 dated recordings in TangoCloud’s catalogue, in years with at least five timed recordings. It says what we hold the sound of, not every record of the year. TangoCloud