A kilometer?? That's .6 miles.
A jumbo roll
Entirely possible.
I used to run a live theatre - we were a 1,600 seat vaudeville house that was built in 1926, and was a "crossover" house - we had a projection booth, Wurlitzer organ, and movie screen...AND a full, live-theatre stage with orchestra pit and complete fly gallery (the area above the stage where scenery is "flown" out of sight for scene changes). A fly gallery is full of battens - pipes that run from left to right, held by (depending on size) either 3 or 5 ropes each; the ropes have to be long enough to go from the stage floor, all the way up to the loft, across the loft to one side of the stage, and back down to the fly rail (pin rail), halfway between the stage and loft, where people would physically pull the ropes up or down to move scenery (or lights) up or down.
All that rope should be replaced every 5-10 years. It runs over pullies; it carries a lot of dead weight; it gets knotted; and it gets sandbag hang points clamped onto it.
Ours (this was in 1998-ish) had been in the air since 1976.
I went to the City (who "managed" the theatre) and told them we needed to buy eight MILES of rope, to re-hang the entire stage. I forget how many we had, but I want to say we had five electrics (battens for the lights) with seven ropes each, and something like 46 scenery battens each with 3 or 5 ropes each depending what load they were designed to carry.
They absolutely lost. their. ****.
So, I took a section of 1/2" hemp rope (the old stuff we used to use), and started scratching at it with my thumbnail. In about five minutes, I'd worn a decent size dent through the dryrotted rope. "We have Martina McBride here this season, along with John Astin, John Amos, George Carlin, Steven Wright...all on the schedule. You're telling me you want all these nationally-known performers walking around under thousands of pounds of equipment, held up by THIS??"
I got my rope. 1/2" Multiline II synthetic. VERY nice stuff, virtually indestructible. Pulling all that hemp out, and stringing all the ML-II, was a long week....