Time Groups enable the filter administrator to create Policies that will apply only during certain time ranges / days of the week.
Time Groups will not have any affect until activated with Access Policies.
Time Groups can be negatable when assigned to the Access Policy, so when creating Time Groups, always consider the smallest time ranges. For example, if the goal is to limit access to all employees except during lunch and afternoon breaks, create a Time Group with lunch and afternoon break time ranges. In the Access Policy, mark that the Policy applies outside of the time group.