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The plant operates 24/7 in some capacity. I've been there at 2AM on a Sunday and the parking lot was full of cars with lots of activity going on inside (from the bit I could see through the windows).
Another thing is that different areas of the production lines have different shifts. You would assume (I did), that they are running 2 x 8hr shifts per day. But in actuality, they are doing a mix of 8/10/12hr shifts depending on areas.