Grandpa Zhang starts working at 7:00, finishes work at 17:00, and takes a 2-hour break at noon. How much time does Grandpa Zhang have to work in a day?
张爷爷7：00开始劳动，17：00收工，中午休息2小时，张爷爷一天要劳动多少时间？
<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<result>8</result>