TFRRS has top times for 2016. Statistically, this is a biased sample because it's only the guys that competed. There are guys on the roster that didn't compete. That said:
All D1: 14:42 500th place. Don't know how many D1 guys competed. Probably >> 1000, so don't know if 500th is average.
Power 5:
- ACC: 16:58 for 89th; 14:36 for 44th place (i.e., average)
- SEC: 16:52 for 54th; 14:51 for 27th
- Big 10: 15:37 for 79th; 14:34 for 39th
- Big 12: 17:00 for 51st; 14:58 for 25th
- Pac 10: 15:47 for 71st; 14:17 for 35th
So, for D1, average is probably sub 15. For P5, it's more like 14:20 - 14:30 for the better conferences--ACC, Big 10 and Pac 10.