Some frustration coming from Dave today. At 62km on the live video he said he wanted to get to Brandon but obviously something happened to make him stop. He said it was very hot but doubt that was the reason. Hopefully we get a reason why
Mental fatigue has been the major issue with trying to run for 12+ hours per day, day, after day, after day. Both of the US Transcon (Sandy VI and Pete K) record setters suffered from that. Cinder Wolff who captained the Mother Ship for both of those record runs said, more or less, you wouldn't believe how hard this [day after day of running] is. Getting the runners up each morning was a major event. The body wants to stop and sleep and recover. Dave is going through exactly the same thing.
The major concern for him is his back. It is not worth a long-term injury to press on through. That is what Mimi Anderson tried to do. She ended up stopping after she eroded away her knee cartilage, and was starting to grind away the leg bones at the knee. Reluctantly she quit. According to a recent blog on her website, a year after her US Transcon attempt, she is no longer able to run. "I missed lacing up my trainers and being able to leave my front door and go for a run – I simply missed my running."