So, now my total is:
That still leaves 34 miles to go, and not a whole lot of time to do it in, but I'm not going to quit.
I'm going to make it all the way. I plan to run on Thursday, Friday, and Saturday this week, which will get me to something like 480 by the end of the week. Then I'll have a week and a half to get 20. I still got time.