Is there some reason the replay video the officials use can't be shown with the time stamp visible? Then all you do is basic math. Time stamp of last frame - time stamp of first frame= total time. Simple.
A digital stopwatch is great, but there is no way to "slow" down a stop watch if you are going frame by frame, especially on buzzer beater type plays. You are then forced to simply re-time game speed replays and hope you get the clicks on the stopwatch right.
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