I realize this is Scubaboard, not Swimboard, but...
I went from just being able to complete the un-timed 200 yd swim test for my OW class to swimming a total of 1500m/day between two to five times a week. (Generally as three sets of 10 laps or two sets of 15 laps, but I do the whole 30 lap grind at least once per week.) Obviously there was a lot that went into that change including sheer tenacity and stubbornness, but the major difference was technique which I learned in TI freestyle clinic I took last spring.
I think swimming skills are important (enough that I've dramatically improved my own swimming) but if people would look at this honestly, any of the swim tests are more about whether you can swim laps in a pool than a demonstration of the watermanship needed for scuba diving. Nobody believes the confined water skills tests in your OW class measured your ability to execute a dive in open water, do they? I think Thal maybe onto something in that its at least closer to the example. Although I know a diver/instructor with a thousand dives who never, ever freedives because he doesn't see the point of two minutes underwater vs. an hour.
I do like the way Nem edited his comment from having to swim a mile in 15 minutes to 30 minutes. Nem, what's your time for 1500m this week? Do you happen to know the FINA Olympic qualifying standards for the 1500m? Here's a hint: It was over 15 minutes. Do you know what time won the gold medal in Beijing, or what the Olympic or world records are? Yeah, I thought not.
For the most part you can get away with pull whatever crap you want like that out of your arse, but if this was a swimming board you'd have been called on that in a heartbeat. That was like saying that a fitness test should include the four-minute mile. Why stop there, why not require the 10km marathon swim in under two hours? This is further proof of why nobody should put any weight on anything Nem says. He makes it up as he goes. Where's that BS flag when I need it?