I agree that something seems to be off, although it would appear that they were doing it in a preseason period or something--no jobs or classes to take care of.
The general principle still works, though. One summer I had a hurdler/jumper/eventual pentathlete who decided she'd do cross-country that fall. She just had a terrible time with continuous running. We eventually tried 110yds (barefoot, on the artificial-turf football field) with 45sec for each run-and-rest. She worked up to 80 of those--five miles' worth--in a single session, which took an hour total.
I promise you that if she'd tried to *run* five miles (continuously), it wouldn't have taken her a whole lot less than an hour, and she would have been sore for days; with the 110s, she got in five miles of running at about 6:00 pace (maybe slightly faster, actually) and finished tired, but still full of running--and had a full training session the next day. (She also medaled in the ECAC pentathlon, the following spring, by destroying the field in the 800.)
For a long time now I've been thinking that a terrible marathoner (as I was: not much under four hours) could average under 8:00 a mile by running 100 x 400 with a 20m walk after each--2:00 for each run-and-rest. You could run them in sets of 20 on the track, with 2:00 of recovery between sets (for pitstops, refreshments, whatever), and still come in under 3:30.
[Yeah, there's an extra 195m to take care of. They could make their last 400m rep a 595m; or they could just walk an extra 50m in each of their between-set breaks.]
The 400s could probably be run in 1:45-1:50--that'd give you time enough to walk the additional 20m by the time the 2:00 was up. Aside from the stress of running 100 laps on the track (maybe I coulda switched directions, each set), I'd bet anything that I could have been under 3:30 with this kind of routine. Getting those little breaks just keeps you fresh.