def get_teaching_hours(school_type):
	"""Return the number of teaching hours / day for different school types."""
	teaching_hours = {
		'primary':4,
		'primary_dc':4,
		'lower_secondary':6,
		'lower_secondary_dc':6,
		'upper_secondary':8,
		'secondary':8,
		'secondary_dc':8
	}
	return teaching_hours[school_type]