توضیحات:

Wifi Timer is an android app that allows you to turn off your wifi connection after a preset amount of time. Use this app to specify when you want your Wifi connection to stop automatically. This saves you some battery life and also makes sure to turn off your wifi after you sleep ...

To use the app click on the clock icon, choose a time period and click set timer and start. The wifi will be automatically disabled after the preset amount of time.