Today, WLAN is always on or off. It is switchable by many options but there is no time based schedule to switch power of WLAN transmitter off.
A common usecase is that the RUT9x device provides internet access over GSM to WLAN in a offshore building. This building is not permanently used by humans (service technicians). Other measuring devices are connected by LAN. The RUT9x is solar/battery powered.
To save battery power, a time based schedule (e.g. WLAN off during night) for switching WLAN power would help here.