Levy Loop intervals

I ran the Levy Loop twice in 46:43, with splits of 12:59, 10:12, 10:19, and 13:13. During the middle 2 miles, I alternated 60 second fast runs with 60 second walks. I was about 30 seconds into my 11th sprint when I finished. That was a pretty hard way to cover 2 miles. It would be nice, perhaps, to have a GPS watch. I think one could tell me how far I went during each of those sprints. But I think a good and maybe better gauge of progress will be my overall time for the loop.