The day of discharge is not chargeable if rooms are vacated by 12:00 noon.
如果中午12点前房间被腾空，退房当天就免交费用。
《柯林斯英汉双解大词典》
2
Guests should vacate their roomsby 10.30 a.m.
旅客应在上午10:30以前腾出房间。
《牛津词典》
3
For example, they watch programs on their own TVs in different rooms, they use the Internet, they talk with friends on the telephone, and they do other things by themselves.