Please add setter for duration property of Run,

so that user can override this in case of custom pipelines, parallel stages, etc.

In Run.java, something like:

/**
 * Sets the {@link #getDuration} of this build.
 * @param d the proposed new duration
 */
 
public void setDuration(Long d) {

    duration = d;
    LOGGER.log(FINE, this + " in " + getRootDir() + ": Run duration is set to " + d, LOGGER.isLoggable(Level.FINER) ? new Exception() : null);
    }
}