Dirty -
I'd hesitate to say that it's "normal". But I've had it happen, too. Usually related to nerve compression and should recover with time. Expect weeks, though, not days. I'm a vet of several 24 hour (and longer) road races.

Now your trick is to figure out what was different this time that made it happen (different shoes, heat, swelling???) and head it off at the pass next time. Things are different after 12 hours.

Best of luck and of course if it doesn't get better, ask your doc.