Duration is the amount of time an event takes from beginning to end; familiar events can be compared as longer, shorter, or equal in duration through direct comparison or simple visual timelines, without calculating with standard units. This understanding distinguishes elapsed time from the time of day an event occurs and supports later measurement of duration using units and clocks.
Duration tells how long an event takes from its beginning to its end. It does not tell the time of day when the event happens.
Example: Which lasts longer: reading a book or putting on shoes?
Imagine both events start together:
Start
|--------------------| Reading a book
|---------| Putting on shoes
The putting-on-shoes event is shorter. If two bars ended at the same place, the events would have equal durations.
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