One way to set WiFi off the network at a fixed time is to use third-party apps, such as WiFi smart timing switch, WiFi timing switch, etc., which can be realized according to the daily timing or periodic network disconnection. Another way is to take advantage of the built-in usage time feature of the phone system, which can be set to disconnect from the Wi-Fi network at a specific time.
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Please note that the setting of WiFi disconnection for a fixed time may vary depending on the phone brand, operating system version or APP version, and it is recommended to set it according to the personal phone system and APP version.