13 miles after work today

I'm trying to make the most of the reasonable conditions and went out again after work today, and got 13 miles in at a purposefully slow pace.  I had a rest day yesterday, but was still feeling a little tired today, so didn't want to push it too much.  Also, I had a little niggle in my right knee most of the way around, but decided to do what I set out to do, which I'm pleased about.  I was pretty tired after the session though.....