I’ve done this a gazillion times. Great training loop. Do a few laps, and you’ll definitely feel it! The last time was for a training set I was doing for the Grand Canyon R2R2R. I did three of these Woodson Loops for a total of 33 miles in 9:54, for an average speed of 3.53 mph. Not speedy, but not too shabby. Definitely crashed at the end — my first two laps were less than three hours each, and last loop was more than four. Oops!