Xiaoxiao's father arrives at the factory at 7:30 in the morning and leaves at 5:30 in the afternoon. If he takes a break at noon every day, how many hours does he work every day?
笑笑的爸爸每天早上7：30到工厂，下午5：30离开工厂，如果他每天中午休息1小时，那么他每天工作的时间是多少小时．
<result>9</result>