This is where it's an advantage to setting up an old PC as a firewall for your network. Stick Linux on it, set up your filtering rules, and let it sit between your home network and the outside world. You can then have it block that PC's access to the Internet via cron scripts, possibly even selectively, between certain times, and there's nothing that anything done on that PC (short of a modem with dialup access) can do to override that.
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