For the sake of discussion then, what's an optimum stint length? At one point when I suggested a 25-gal. cell, one learned individual said, "I sure as hell don't want to be in the car for 3-1/2 hours!" - or words to that effect.

If the tank is too big, the maximum time-in-car rules at most events will make it impossible to double-stint a driver. If that's a factor, the magic number at VIR would have been 2 hours' worth of gas.

K
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Nothing personal to the person that made the comment, but if they're not prepared to do a 3 - 3.5 hr stint, they're not the person that you want for a 24 hr race. Double-length stints like that are pretty much required for a 24 hr race if you want any chance at a win.