Half an hour is plenty long enough to zom out on some brains, then get strapped into the chair. Even then, they can just set the timer for more time if they need it. If the power goes out, then good news! You get another serving of someone else’s brains tomorrow
Maybe if they set the timer to go on and off at set intervals or made you eat the meal in the chair, which is unusual.
Otherwise you could take your sweet time eating that brain stem and they’d be unable to put you in a live chair without risking anyone else.
There’s also the problem of what to do if there’s a power outage.
Half an hour is plenty long enough to zom out on some brains, then get strapped into the chair. Even then, they can just set the timer for more time if they need it. If the power goes out, then good news! You get another serving of someone else’s brains tomorrow