Short Story Length

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What is the average length of a Science Fiction / Fantasy short story? 


I think in general Science Fiction and Fantasy tend to run a bit longer than the average Fiction or Non-Fiction piece.  I believe they usually run about 10-15 pages.  The general description says "less than 7,500 words."


I have about 4 pages at 800 words so If I keep going at that pace it should be fine and you could be looking at around 20 or 25 pages.


I always worry that I won't have enough time, space, or room to fit everything and it causes stress!  And we all know stress is a killer of creative juices and energy.  I think I'll shoot for 20 pages.