The first two miles went well, then I stopped for a loo break and noticed that I was POURING with sweat. Much more than usual. And it all went downhill from there. Very quickly.
Dialed down the effort to the bottom of my training range, 139 heart rate, because I thought I was going to explode. It wasn't pretty. The pace came in at 9:28 for the 20 miles. 3 hours 10 minutes of not being very happy at all. After adjusting for heart rate, that's slightly worse than Monday's run. Booo!
Actually the graph would still look OK, if Monday's run could be erased from history. But that would be cheating!