When you create rules, you can apply a schedule to the rule to determine when it is in effect. Microsoft Forefront Threat Management Gateway is preconfigured with the following schedules:
Weekends. This schedule permits access at all times on Saturday and Sunday.
Work hours. This schedule permits access between 09:00 (9:00 A.M.) and 17:00 (5:00 P.M.) on Monday through Friday.
Preconfigured schedules cannot be modified or deleted. You can create your own schedules and apply them to both access rules and publishing rules, to define when a rule is active. If you do not apply a schedule, a default schedule allowing access at all times is automatically applied to access rules and publishing rules.