The first and second loops went quite smoothly. The loop actually turned out to be just a bit more than 5.5 miles; hence it took me just over 46 minutes to complete it. My pace, cadence and breathing all felt smooth. It was in the third loop that I started feeling signs of fatigue. Towards the end of the third loop, I was unhappy and lethargic. The short break helped me and I started off on the fourth loop only to lose steam after a couple of miles. The final three miles were torture. Thankfully, the final mile was warm-down and I could relax just a bit. I also cut down the fourth loop a bit so I could finish the run exactly at my office at the end of 3 hours.
I ended up doing 21.5 miles at an average of 8:22 per mile. Quite satisfactory. I have no idea though how I will do an extra 5 miles to finish the marathon.