You could try being a parent and telling your son not to play during certain hours or you’ll bust his ass!
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What a useful answer…
You could create a cron job that removes and adds the permission for execution from the emulationstation binary. After that the GUI can only be started during certain hours. But that would only stop emulationstation from working. The different emulators would still be executable.
or you could cut the line from rc.local (i guess) that runs ES, run your own script instead where you check what time it is and them if the time is allright you paste the line which runs ES, else you poweroff. i don’t think your 7yo son would get around this 😀