Google and some reddit thread tell me that men take about four hours and twenty minutes, on average, to complete a marathon. So if the negotiations lasted at least that long, they were "marathon".

We Americans and our weird systems of measurement!
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How many foot pounds per mile?
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Depends on whether it's an Imperial pound (the weight of one of George II's feet) or an American pound (the weight of one of George Washington's feet), and whether the mile is from land or water, and if water, western or eastern hemisphere, and if eastern, whether it's from the Thames or not.
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