The SI unit for time is the second, s.

Factors in boldface are exact.

Convert	From	To	Multiply
millisecond	ms	s	0.001
microseconds	μs	s	10-6
nanosecond	ns	s	10-9
minute	min	s	60
hour	hr	s	3600
day	d	s	86400

BS 350:2004 Section 10

 

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