20:53

Attempting to set PR beating 21:03, I went out at 5:37 pace for nearly 1/2 mile before I ran out of gas and had to stop and walk. ... I walked about 50 feet before I started jogging again and then got back to jogging. I pushed on instead of going home defeated but somehow still set my PR of 20:53. Makes me wonder what I could have done it I had gone out at 6:27 and maintained that pace.