Etymology
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run-time (n.)

"length of time taken in a particular task," 1974, originally in computing; see run (v.) + time (n.). In computing, run (n.) "instance of execution of a program" is by 1946.

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Definitions of run-time

run-time (n.)
the time at which a (software or multimedia) program is run;
run-time (n.)
(computer science) the length of time it takes to execute a software program;
From wordnet.princeton.edu