Interesting analysis @dalz!
I remember someone running an analysis on readership vs. article length on writing site HubPages many years back and the conclusion from analyzing 100,000's of posts was that there were actually TWO "sweet spots" in terms of article length vs. page views/time spent. One was 500-750 words which is your typical "news story" or quick update... and the other was 2,000+ words, which gets into the territory of thorough research article.
What you found here with rewards as the metric does seem to somewhat bear that out.
Long isn't always better, though. Long is only meaningful if there's truly some "meat" there to be read.
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