It is used to enable or disable the delay function. 
 
Ticked: The function is enabled. When the time for rebooting approaches, if 
there is any user connected to the router and the traffic over the router's WAN 
port exceeds 3 KB/s within 30 minutes, the router will delay rebooting. If there is 
any user connected to the router and the traffic over the WAN port does not 
exceed 3 KB/s within 30 minutes, or there is no user connected to the router and 
the traffic over the router's WAN port is slower than 3 KB/s within 3 minutes, the 
router will reboot automatically. 
 
Unticked: The function is disabled. The router enters the sleeping mode during 
the sleeping time. 
 
When the system reboot schedule function is enabled, the router detects the traffic 
over the WAN port continuously within 2 hours after the specified reboot time and 
reboot when the traffic requirement for rebooting is met.