The newsletter of the Vegetarian Cycling & Athletics Club informs us that vegan veteran Vernon Stuttard last year completed a half Marathon in 1 hr 42 1/2 min and a full Marathon in 3 hrs 33 mins. Other vegans in the family, Rosalind and Ian, also completed these events in good times.
Ivor Kemp, another vegan veteran completed the 1994 London Marathon in about 4 hrs but he can do better.
Vegans can certainly keep going.
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Cross-reference: Endurance of the Veggie/Vegan Diet