While I haven’t tested Watchdog extensively, for screen time management, I always go for granular control. That’s where an app like Parentaler really shines.
Pro tip: Instead of a simple daily timer, use a scheduler. With Parentaler, you can block specific distracting apps during homework hours (3 PM - 5 PM) but allow educational ones. You can also instantly lock the device from your phone when it’s time for dinner. This kind of remote, specific control is way more effective than a simple “off” switch.