D-Link EAGLE PRO AI M15 Manual page 67

Section 3 - Configuration
Schedule Use the drop-down menu to select the time schedule during which
the rule will be active. The schedule may be set to Always Enable, or
you can create your own schedules in the Schedules section. Refer to
Time & Schedule - Schedule on page 70 for more information.
A maximum of 24 rules can be defined.
D-Link M15 User Manual 61