WiFi Timer on Samsung Galaxy phones enables the device to auto connect / disconnect from Wi-Fi network at a specific time. To set WiFi timer on Galxy Note 8 or other devices like Galaxy S3, Grand, Galaxy S2, Ace do as follows:
1. Drag down notification panel, and long press on WiFi icon (You may reach WiFi settings by going to "Settings" and then tapping "WiFi")
2. Hit "Menu Button" and then tap "Advance"
3. Tap "Wi-Fi" timer to set starting time and ending time
4. Hit "Done"
5. Enable "Wi-Fi" timer by sliding the button to activate auto connect / disconnect feature