A nanosecond (ns) is one billionth of a second (10-9 s). One nanosecond is to one second as one second is to 31.7 years.
An order of magnitude is the magnitude, or scale, of a class of numbers such that the numbers in that class have a fixed ratio to the class preceding it.
In the most common usage of the term "order of magnitude," the fixed ratio is 10 and the scale is the base-10 exponent that is applied to 10. Therefore, to be an order of magnitude greater means to be 10 times as large. Nanosecond