Xbox 360

1. Scroll to settings and press the A button.

2. Scroll to System and press the A button.

3. Scroll to Console Settings and press the A button.

4. Scroll to Startup and Shutdown and press the A button.

5. Scroll to Auto-Off and press the A button.

6. Scroll to your desired setting (E.g After 1 Hour) and press the A button.