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Good idea for a test.
However, I'm not sure that the seeing would make a 10 min sub twice as bad as a 5 min one. I think that they would be about the same.
ie- If the seeing smears a star to 5 arcsecs it will do it just as much in a few seconds as 10 mins.
What will happen though is the 10 min sub will saturate bright stars further from the gausian centre resulting in bigger star images. These would not be 2x as big. A star images brightness will fall off exponentially from the centre making the star somewhat bigger in the long exposure.
Non saturated stars should be the same size but with a better S/N in the longer exposure.
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