prolongation

(noun) the act of prolonging something. Synonyms: protraction, perpetuation, lengthening. Example: "There was an indefinite prolongation of the peace talks."

(noun) amount or degree or range to which something extends. Synonyms: extension, lengthiness. Example: "The wire has an extension of 50 feet."

(noun) the consequence of being lengthened in duration. Synonyms: lengthiness, continuation, protraction.