Method of

base/src/main/java/net/time4j/MachineTime.java:191–212

(
        long amount,
        TimeUnit unit
    )

     * @since   2.0
     */
    public static MachineTime<TimeUnit> of(
        long amount,
        TimeUnit unit
    ) {

        if (unit.compareTo(TimeUnit.SECONDS) >= 0) {
            long secs =
                Math.multiplyExact(
                    amount,
                    TimeUnit.SECONDS.convert(1, unit));
            return ofPosixUnits(secs, 0);
        }

        long total =
            Math.multiplyExact(
                amount,
                TimeUnit.NANOSECONDS.convert(1, unit));
        long secs = Math.floorDiv(total, MRD);
        int fraction = (int) Math.floorMod(total, MRD);
        return ofPosixUnits(secs, fraction);

    }

    /**
     * <p>Creates a machine time duration on the UTC scale. </p>