Ran with a friend of mine on the Academy. Ran about 41 minutes. Gradual downhill on the way out, amazingly hard uphill on the way back. ;) I actually had to stop and walk about 30 minutes, very frustrating, but we did finish ok. Saw some deer at the end of the run. Ran around at soccer practice after that! Fun.
Based on this route I am estimating 3.6 miles.