No long at 15mph on most dogs but if you’re dedicated enough and consistent with it.
an average man will run a 5k at 20/25 mins
But men can run it in 13 mins which would seem impossible to most people but end of the day both just humans.
so plenty witness’s saying that’s what the man does,so that’ what the man does what more proof do you need.
ps I think he would beat you day or night not that you would go and challenge him