The calculated 473.6 - 495.3 miles from the video analysis (based on 19 hours and 20 hours per day running, respectively) of Amy Hughes is contingent that she didn't engage in other acts of cheating in the missing live stream videos and that she is being truthful with her claims of running between 18-20 hours each day.
I think she did do a decent amount of running and spent a decent amount of hours on the treadmill but unless we are able to obtain other evidence, we will have to work with her claim of 18-20 hours per day spent getting mileage. Her true average time spent on the treadmill could be closer to 18 hours per day rather than 19 or 20 but my calculations have a sizable amount of a benefit of the doubt built in to avoid the possibility that we underestimate what she did, which would be counter productive.
Do you believe she ran 500 miles? 450? 400?
Honestly, in your opinion, how far do you think she ran? You don't have to back it up with science. There is no evidence of her running history anyway (her claiming to run 350 miles a week as training is similarly ludicrous).