The 14 miles at 5:30 pace is not that big of a deal for the caliber of runners that UVA has. It's a very solid run, but well within their aerobic limit.
What's more important is how it falls in with the rest of the training. It's important to have context, because without it, a single workout is meaningless.
For example, if a week looks something like this:
M - Recovery Run - 60-65 minutes easy
T - Workout - 10-12 x 1k w/2:00 active recovery @ current 10k-15k pace
W - Recovery Run - 55-60 minutes easy
T - Recovery Run - Morning -20-30 minutes easy/Afternoon - 45-55 minutes easy
F- Workout (Tempo Effort) - 3 mile warm up and cool down/4 miles @ tempo effort
S - Recovery Run - 45-55 easy
S - 14 mile Long Run @ 5:30 pace (You're typically going to start out easy and end up averaging around 5:30 in this run, as a previous poster mentioned)
That's a solid strength week, but it's not ridiculous. The big thing that most coaches don't realize is that you literally just have to listen to the athletes' bodies and allow them to properly recover.
College athletes especially have high demands outside of running (but have the same nervous system and musculature to deal with all demands) and that has to be considered when writing a training schedule.
The two most important tidbits to racing well when it counts:
1. No big workouts matter 10-14 days from race day. They will just take away from the race (This is for most standard training systems. There are always exceptions.)
2. Don't over-taper. If you do not provide enough stimulus to the body leading up to a race, you will be flat come race day.