I don't see four running days so I can't make a real good observation or give you an idea on how to create a full day off.
I will say that there is no rule that you have to take a full day off each week. I would strongly reccommend doing so, but I see fanatics who do 7 workouts a week.
My advice would be to take a Sunday and go for a casual walk instead of a run. Give the joints a break. Aid in overall recovery.
If you just can't make yourself do that, wait until you hurt yourself and then you'll have some time to recuperate.