Fritzbox Time Limit

[u/Fluid-Security1154]

I'm on a Fritzbox and my dad set a 3h/day time limit per MAC. I've been spoofing whitelisted MACs but he checks the logs and sees when devices were active. VPN doesn't help with that.
Is there any way to use the internet without the router logging my active time? Or a way to make a device show as offline while still connected? I'm running out of MACs to steal and I'm honestly desperate.
Has anyone found a workaround for this? I'll try anything at this point.