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# How long is a nanosecond?

Not very ;-). A nanosecond is one billionth of a second, which is0.000,000,001 s. Written in engineering notation, that's 1E-9 s. Think of it this way: Take one second, and ch…op it up into one thousand equal pieces. Now, take One of Those milliseconds; chop It up into one thousandequal pieces. Now, take One of Those microseconds; chop It up into one thousandequal pieces. One of those pieces is a nanosecond! Light travels about one footin that amount of time. ( Full Answer )