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Definition of Running time
1. Noun. The length of time that a movie or tv show runs. 
Medical Definition of Running time
1. The time during which an activity (e.g., chromatography development) occurs. (05 Mar 2000)
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1. Noun. The length of time that a movie or tv show runs. 
1. The time during which an activity (e.g., chromatography development) occurs. (05 Mar 2000)