docs: public B timerWithDuration(String timerDuration) {
      TimeDuration timeDuration = createInstance(TimeDuration.class);
      timeDuration.setTextContent(timerDuration);
  
      TimerEventDefinition timerEventDefinition = createInstance(TimerEventDefinition.class);
      timerEventDefinition.setTimeDuration(timeDuration);
  
      element.getEventDefinitions().add(timerEventDefinition);
  
      return myself;
    }