i did the earlham one, around 3ish, it was pushing 100 for temps at the time also. i was running with the wife and 2 of her gimpy co-workers. i finished at 27 minutes +/-. you can't really do this run for time unless you are near the front. another co-worker did the same time though, slipped to the front and finished in 19. the fastest time for the day was around 17 minutes i believe.
Ahh, I thought we were talking the 20k. I have not input on the 5k.