1 second = 1,000 milliseconds
1 minute = 60 seconds
15 minutes = (15 x 60 x 1,000) = 900,000milliseconds
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1 second = 1000 milliseconds (milli = thousandths) so 15 seconds = 15000 ms.
A millisecond is one thousandth of a second.
1000 microseconds = 1 millisecond
there are 1000 milliseconds in a second.
I have never heard of a macrosecond. However, there are 1000 microseconds in a millisecond.