One of the great things I've discovered about running around Atlanta is that the altitude changes are very unassuming. Yesterday's run was a little over 7 miles (7.25 miles based on Map My Run) of rolling hills. Those 7.25 miles had about 300 feet of positive and negative altitude changes. I was able to keep my pace steady, slow, and EZ. My heart rate averaged 144 bpm even with all the undulation so I would call that an EZ run.
These days, I consider anything over 7 miles to be a long run. Couple those miles with hills at every turn and you've got a great workout. I will probably run the same route next weekend. I saw a couple of other side streets that had some good long slow inclines. Depending on how I feel, I might turn those 7.25 miles into 9 or 10!