Hydration question (1)

During the final miles of a distance race (say >10K run) at what point or aid station do you no longer hydrate? Given the science, or lack there of, regarding rate of fluid absorption is it worth the “cost in time” to slow down or walk at the final 1, 2, 3, etc., mile aid station?

During marathons or half amrathon, I usually grab something with 1-2 miles to go simply so I can whet my whistle. It doesn’t help with hydration at all, but feels decent.

Bob