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The hour (h) is a time unit equal to 60 minutes or 3,600 seconds, the standard measure for work shifts, travel times, and business hours worldwide. Payroll calculations, flight durations, and daily schedules are all structured around hours. One hour equals exactly 3,600 seconds, and 24 hours make up one day.

The millisecond (ms) is a time unit equal to one-thousandth of a second, critical in computing, telecommunications, and scientific experiments where precise timing matters. Network latency, camera shutter speeds, and reaction time measurements all operate on the millisecond scale. One millisecond equals exactly 0.001 seconds, and the human eye can barely perceive changes faster than about 10 milliseconds.