This option set the max week days names length by setting the property CalendarComponent.MAX_WEEK_DAYS_NAMES_LENGTH.
The code below changes the maximum number of letters used for displaying the week days names: 
<CODE>
CalendarComponent calendarComponent = new CalendarComponent();
calendarComponent.setCalendarProperty(CalendarComponent.MAX_WEEK_DAYS_NAMES_LENGTH, new Integer(2));
</CODE>
