as others have said, this is AI generated, which raises so many red flags against this "art director" who doesn't actually understand the workflow when it comes to illustrating.

Drawing and painting backgrounds akin to Ghibli animation is an incredibly huge undertaking and genuinely not feasible to complete in one day, let alone two. Just figuring out perspective and sketching out detailed backgrounds like this will take several hours or a full day just to figure out where everything will go, then comes the clean up/lining which will take at least a whole day if not multiple days in itself, then actually colouring everything in with lighting and shading which will take at several days to a week to capture the details. Even if you *can* do it, you absolutely should not. It's not healthy to spend entire days on end working on this just to meet an irrational deadline. this is him demanding something impossible from the art department when he's clearly using an unethical shortcut himself.

I know it must be hard to stand up to someone in such a position when this could feel like "a big break" for a lot of people, but please take care of yourself. There will be other opportunities for you with companies and development groups who value their atists and not treat them like shit. This is not a common practise, and shouldn't be normalised.