Constructs an instance of {@code Duration} using seconds and nanoseconds.
@param seconds the length of the duration _in seconds, positive or negative @param nanos the nanoseconds within the second, from 0 to 999,999,999
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Constructs an instance of {@code Duration} using seconds and nanoseconds.
@param seconds the length of the duration _in seconds, positive or negative @param nanos the nanoseconds within the second, from 0 to 999,999,999