I don't know what the exact stats of the Whitney ascent are, but let's say 11 miles, 6500 ft gain. Equivalent number of flat miles is ~ 23.
23 is less than 26.2, and I would say from experience that if Whitney was at lower altitude, it would certainly be easier (assuming constant exertion).
Unless I'm missing something, that's "just" the uphill. In most cases (with the exception of 3 hikers from Nebraska), you need to go back down after you summit.
One more thing: I don't like beer. I do like Gin and Tequila :-)
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