Gondak is a great coach but he wasn't the architect of the training a few years back when we had multiple 3:58-4:05, 1:47-1:49 guys, Don Webber was. Not to take anything away from Gondak or say he didn't have quite a bit to do with the success, he did.
The previous poster is right, the mileage was more around 60-70 mpw but very, very fast relative to other schools from what I've heard. It was not uncommon to run at or under 5 min pace for the back half of daily runs in XC season. Tons of competition that pushed guys to run faster.
No doubles- but track workouts routinely took 2.5-3 hours to complete, with intermittent runs separating track intervals. Example: 5 miles moderate(5:30-6:00 pace), 10x400 with 90 seconds recovery, 3 miles moderate, 8x200 full recovery very fast.
It worked for us at the time, but I would say that you need a competitive core of runners for the system to be successful. You can certainly mail it in if you want to.