I would say that the Margaret location is in an area that doesn't have much late traffic. Lots of busy medical offices and the hospital close by are plenty of business during those hours they've chosen. Even though they do have a small bar area, it's not really a hot spot.
It's a business and if that's the hours they've designated it is what it is probably a better question for the restaurant itself
Perhaps that's a question for the restaurant not Google
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