noun
In this case, 'path length' is a noun phrase consisting of two nouns that together describe a specific distance or measurement along a path.
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The path length of the shortest route between the two cities was calculated to be 150 kilometers.
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I can't believe the path length to get to the beach is only 10 minutes from here!
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The path length to the party is just a hop, skip, and a jump away.
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The path length to success may be long and winding, but it will be worth it in the end.