For what it's worth I watched the 11hr55 which I believe is from day 5. The one where she hangs on the treadmill bars.
I skipped through in 10-20sec segments noting the times where she changed from run to walk to break and occasionally doing a count of logos for the treadmill speed.
What I saw in that time was 7hr55 running, 1hr26 walking, 2hr33 breaks.
The running was consistent at 37 logos per minute throughout.
The walking was about 27-28 in the early stages, sometimes a bit slower at 25 but from about the 8hr mark she began to do faster walks at 30 because the running segments were getting shorter.
Based on belt length of around 130inches, I'm going for running speed of 4.6mph and walking speeds that vary from 3.1 to 3.7mph.
In a 20hr segment we can pro-rata her numbers to be 13hr20 running, 2hr30 walking, 4hr10 breaks.
Which gives us 61.3miles run and 7.75 - 9.25miles walked which is a total of around 70miles per day. Oh dear!
As for the hanging on the bars ... it definitely benefited her.
In the middle of the period when she did that she took a short break and her friend helped her massage/stretch her quads.
It's clear that she hung on the bars because her quads were beginning to hurt and hanging alleviated the pain thereby avoiding the need to stop or slow down.