Hardly ever lasts a full 20 min--never, I should think--because duration is actually something like 7 min on P99 IIRC.
But on balance I concur that P99 is close enough to broadly agree with those old posts. That's why we have this thread at all--if it was more obvious we wouldn't need this discussion. That's also why I personally don't want to see alteration without very strong evidence and hard numbers. As I said, I don't want to see the pendulum shift too far the other way.
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