def split_duration(start_hour, duration):
	"""
	Split the interval [start_hour, start_hour+duration] into two
	equal parts separated by a 1h break and return a list of start and stop hours.
	"""
	pass
	start_hours = []
	stop_hours = []
	
	half = duration // 2
	start_hours += [start_hour]
	stop_hours += [start_hour + half]
	
	start_hours += [stop_hours[-1] + 1]
	stop_hours += [start_hours[-1] + duration - half]
	
	return start_hours, stop_hours