All the time — Cole Porter song from the 1932 musical Gay Divorce (5,3,3)

I believe the answer is:

night and day

(Other definitions for night and day that I've seen before include "24 - 7" , "Play" , "twenty-four hours in length?" , "Cole Porter music" , "All the time (Sinatra song)" .)

I've seen this clue in The Guardian.

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