Zhang Li arrives at school at 8:00 in the morning, and leaves school at 5:00 in the afternoon. He has a two-hour break at noon. How many hours does Zhang Li spend at school in a day?
张力上午8：00到校，下午5：00时放学，中午休息两小时，张力一天在校时间是多少小时．
<result>9</result>