This read-write RlTBIWeekDayList bitmap lets an admin select multiple days of the week at once for a periodic (recurring) time range, with the rule applying on whichever days have their bit set; when any bit is set here, the separate weekday fields in rlTBIPeriodicStart and rlTBIPeriodicEnd must be zero. Admins use it to define a schedule like "weekdays only" or "weekends only" in one object instead of creating separate rules per day. For example, an admin restricting guest network access to business days sets bits for Monday through Friday in this bitmap rather than configuring five separate single-day time ranges.