6 miles? Holy....
To answer your previous question, I will run twice a day if I have time. I don't go over an hour total, though. Like today, for instance, I had the whole day to myself so I did 20 minutes before lunch and then 30 minutes before dinner. Sorry about your knee! MY BF has that problem and it bothers him to no end. Have you tried taking it easy and wokring on a bike? I know that is used for therapy...
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