it's weird to bring up the marathon like "but not for this" when you have coverage for all the on-track stuff between the two ladies. yes, i don't think you can go 26 mi running 25 mi a week. duh. but this girl and valby say if you don't have to go further than 6.2 mi a race then do you really need it all, particularly if you are cross-training seriously. answer? no.
now, underline seriously, because i assume their idea of an elliptical is not 5 mins like joe down at the gym. in light of that, comments like "that's not mileage" miss the point. they have work ethic. they are merely dividing it out and not making it all "surface running." a lot of this thread, to me, is people with egos who want all the work to mean something and measure it in miles. her response, you can cross-train, you should maybe reduce the mileage and the pounding. it's not go put 2 feet up in a chaise lounge. it's it doesn't have to be all running.
personally my theory is you don't need more than 2-4x the race distance per day. if you run 800m you only need a few good miles, and 3-4 miles a day gets you her total. i also believe you can offset some of that with other cross training endurance work, if you do enough. emphasis on enough. i think people are getting into "doesn't count" arguments because they're not considering how long a machine workout for the two ladies probably is. it is likely not messing around. and as such it's not lazy, it's just intended not to be ground pound work. it's about saving legs rather than not putting in miles per se. and i am sure they are measuring by time/distance the machine work.
i personally loved pool work for aching legs and thought i was best/freshest/healthiest when given a dispensation for how much soccer i played. i also found it telling my best efforts -- and others' -- often came off the taper which to me suggests over-training (if your best time comes when rested i am not sure if that is really saying all the work is bearing fruit, it could also be saying your body is responding well to reduced practice). and we did 30-40 mi in HS XC.
circling back around, i definitely think you don't need all this for the 800. further out i think you need more mileage to have legs ready for the distance. i personally think a lot of the mentality, though, is like taking ideas meant for 8k+ college types and applying it to people on down to 800 if they show up for XC or even some TF programs. my personal experience as you pushed out towards 40 you started losing top gear.
but anyhow, my point was they're not spending 5 min on the machine, it's probably a ton, and "does it count for mileage" then misses the point.