public void setAnimationDuration(int duration) {
		if(duration < 0) {
			throw new IllegalArgumentException("Duration is less than zero");
		}
		
		animationDuration = duration;
	}
Set's the Animation duration for the Expandable animation

@param duration The duration as an integer in MS (duration > 0)
@exception IllegalArgumentException if parameter is less than zero
library/src/main/java/com/tjerkw/slideexpandable/library/AbstractSlideExpandableListAdapter.java