FWIW, I wrote a novel after only having written a tiny handful of stories, none of which were over 5000 words. So it is entirely do-able. And having an idea that grabs you and demands to be novel-length is the best way to do it.
I wrote a post about what I learned about the process, in case it's any use:
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Date: 2010-10-09 01:56 pm (UTC)FWIW, I wrote a novel after only having written a tiny handful of stories, none of which were over 5000 words. So it is entirely do-able. And having an idea that grabs you and demands to be novel-length is the best way to do it.
I wrote a post about what I learned about the process, in case it's any use:
http://rydra-wong.dreamwidth.org/129059.html