A worked example
Durations of 5 and 3 seconds produce spans 0–5 and 5–8 seconds.
Review shot start and end times, total duration and a simple proportional timeline.
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Each start is the sum of preceding durations; the final end is the total running time.
Durations of 5 and 3 seconds produce spans 0–5 and 5–8 seconds.
No overlaps or transitions are modeled. Timing is a planning estimate, not a rendered movie timeline.
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