I'm not so sure it cares if you stay in the area once you reach the objective to activate the "sink merchant shipping" portion. I was on patrol in the Java sea, but slowly worked my way eastward until I was nowhere near my objective. I sank some shipping near the Torres Strait (NE corner of Australia) and noted that my objective changed to "complete"....if I'm not mistaken, that was well over 1,000 miles from my assigned patrol area.
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