Congcong's mother is a civil servant, who implements a "9-to-5" system at work, that is, she goes to work at 9:00 in the morning and leaves at 5:00 in the afternoon. How many hours does his mother work a day?
聪聪的妈妈是位公务员，上班实行"朝九晚五"制度，也就是早上9：00上班，下午5：00下班．他妈妈一天要工作多少小时．
<gadget id="calculator">17 - 9</gadget>
<output>8</output>

<result>8</result>