When school's out, WoW's in ... Is that the usual state of affairs at your house? If you want to limit the times when your kids can log in – protecting evening study time and bedtime, or setting weekend, holiday and vacation limits – then you need Blizzard's parental control feature. Parental control settings allow you to choose blocks of time that an account is and is not accessible for play. Players cannot log in during restricted hours, and they'll be automatically logged out if they play past their allowed time window.
The parental control is part of the account user interface on the web. Anyone who has access to an account's log-in and password can set up parental controls on the account. Once parental controls have been created, they may be modified only with access via a parental control password.