He's not going to be starving as Luxord frequently over feeds because of stuff.
But the simple act of waking up and remaining animated burns away at stored blood and the beast demands to be fed regardless of actual need.

So it'd probably be at 'man I need breakfast now' rather than 'I MUST FEED' but his guts will ache from it and it will get worse the longer it's put off.

...if that makes any sense at all.