duration : NUMBER DURATION_UNIT duration

def p_duration_number_duration_unit_duration(self, p):
        'duration : NUMBER DURATION_UNIT duration'
        logger.debug(
            'duration = number %s, duration unit %s, duration %s', p[1], p[2],
            p[3])
        duration = Duration.from_quantity_unit(p[1], p[2])
        p[0] = duration + p[3]