This is the 13329th most frequent Spanish word.
quilométrica
Extremely long or lengthy.
Here, "quilométrica" is used figuratively to describe the long length of the line, emphasizing exaggeration.
La fila para entrar al concierto era quilométrica.
The line to enter the concert was extremely long.
In this case, "quilométrica" is used literally to specify the length of the rope, which measures one kilometer.
Compré una cuerda quilométrica para mis actividades de escalada.
I bought a kilometer-long rope for my climbing activities.
Here, "quilométrica" describes a distance that spans approximately a kilometer, possibly emphasizing the noteworthy length.