If the only ressie I can get for Brown Derby is at 4 pm, what time do you think we would actually eat . . .? This would be on the Fantasmic package. Do they seat you right away? Or is there a wait once you arrive at 4 pm.
But if you were hoping to dine later, call back closer to your trip...2 to 4 weeks out, more dining times tend to open at the Disney Studios restaurants as well as those at MK.