I too don't find any difference in my ebook and pbook reading with respect to my preference of story length.
Over the last decade and a half that I've been a serious ebook reader (~60-70% of my reading over that period on average, though more like 90% now) there is no significant difference with one exception. Ebooks make it practical to "publish" single short stories. This has caused me to read a somewhat larger percentage of short stories. I often find a single story that I would have not noticed if it was buried in a collection.
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