Time and distance set different tasks
A timed interval ends when the clock says so. A distance interval ends when the route is complete. They may look similar on a training plan, but swapping one for the other changes what is held constant.
Walk through the difference
Two runners doing 30 seconds of work may cover different distances. Two runners covering 100 meters may take different amounts of time. Neither format is automatically better. They simply organize the task differently. Terrain, turns, and the way a device measures distance can add more context. Use the format your plan intends rather than translating it by guesswork.
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