I ran for two hours on the Jordan River Parkway and had a great run. I ran for 10 miles. I took walking breaks every half mile, and most of the breaks were 45 seconds to a minute. For about 7 1/2 miles I ran at a 10 minute pace. Then, even though I wasn't tired, I slowed to a 11 minute pace, and during the last mile I ran 11:30 - 12:00 minutes. I slowed down because I decided I'd done enough speed work, and I slowed to a comfortable recovery pace.
For my current condition, a 10 minute pace is a fast pace, but it isn't quite fast enough to be a tempo pace.