It is on Windows 10 64 bits.
Before log in, kid can simply disable the wifi, then after logged in, the NF will show "Norton Family is unable to proceed, because it could not communicate with the server. If you continue, your parent will be notified that you are extending your time on the device. Do you want to continue?" Of course kid will clict Yes button.
Then kid can play any games, or read any PDFs without any time restriction. He just need to make sure he is offline. There will be no alert sent out, even later the PC is online. So if parents are out, nobody knows how long the kid plays the PC.