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I'll do my best to explain, however I have been thinking about it for a while.
I have a 50k coming up. Furthest I have ever ran is 20 miles (Saturday just gone) I managed to run the lot with a few hills in the hacking rain. I done 11 minute miles. I also had a 5 minute break at 12 miles (toilet food etc) So it may be a little under 11MM. At the end I could have given a little more, but not too much., Perhaps had another 3 miles in me before I really started to die.
Question is: Is it better to be out there longer running at a slower pace or quicker and not be on your legs for so long??
Hope this makes some sense.??