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Indeed it is SI. However, it is important to make a
distinction between specialized vs. everyday uses of time units. For
example, seconds are used exclusively, without minutes or hours, in ballistic
missile and space mission launch & descent timelines. (Launch at T=0
s, staging at T+87 s, payload fairing jettison at T+247 s, second stage shutdown
at T+429 s, etc.) This is similar to the practice of using only
millimeters for engineering drawings and architectural drawings.
For everyday expressions of time, hours/minutes/seconds are
more practical than "SI-esque" multiples such as hectoseconds, kiloseconds, and
megaseconds. -- Jason
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