This is the 1858th most frequent French word.
longueur
Length.
In this sentence, 'longueur' refers to the measurement of an object in terms of its physical dimensions, specifically its length.
La longueur de la table est de deux mètres.
The length of the table is two meters.
Here, 'longueur' is used figuratively to indicate that the discussion was prolonged or thorough.
Il a discuté avec longueur des problèmes rencontrés.
He discussed at length the problems encountered.
In this instance, 'longueur' signifies the duration of the movie, suggesting that it is longer than desirable.