In The Vocabula Review, "Scarcely Used Word" I encountered "longeur" defined:
" longueur (long-GUR) n. a long, tedious passage in a work of literature or performing art. "

I have been unable to find any confirmation of this definition, and think it erroneous.
at best a clumsy coinage.
"la longeur" in French means "length". I found French usage of it for length of eyelashes,
length of hair, length of waves of light, etc.
The only use of it in English I could find was an essay by George Orwell, quoting Byron,
but not defining it, and not worth quoting here.

Anyone care to defend The Vocabula Review's definition. When I tried to get into a forum
there to discuss it, and clicked on the button provided I found myself out in the alley with
the door shut and locked. Twice. Badword them.