6 miles in great weather

Nice weather today, although a bit warm and sunny for running (but I'm not complaining).  It was a hard run, and my longest in a while.  I want to get up to around 15 miles, and a few 5 milers in the middle of the week.  If I can consistently maintain that kind of running schedule through the nice months, and back off a bit for the winter, I'd be satisfied.