How to Adjust Auto Power-Down Duration
What to do:
1. From the Wii U Menu, select "System Settings."
2. Using the Left Stick, scroll to the "Auto Power-Down" icon and press the A Button.
3. Select "Use" then tap "OK."
4. Use the up and down arrow to select the desired duration (in hours) before the Wii U will automatically power-down when idle.
5. Tap "Confirm."
6. Tap "OK.