code: @Nonnull
    public CacheControlBuilder setMaxAge (@Nonnull final TimeUnit eTimeUnit, final long nDuration)
    {
      return setMaxAgeSeconds (eTimeUnit.toSeconds (nDuration));
    }
docs: Set the maximum age relative to the request time
  
  @param eTimeUnit
  {@link TimeUnit} to use
  @param nDuration
  The duration in the passed unit
  @return this