I don't know what the actual limit is (or even if there is one), but I try to keep my posts to no more than 3,000 or so words as a rule. I have gone up to about 5,000 once or twice, but I feel that was a bit too long to make for an easy read.
I don't know what others think, but I'm always conscious that people on here seem to want to dip in and out fairly quickly a lot of the time, so that's why I try to keep the posts smaller. But I am definitely not a fan of stories posted in tiny bite-sized pieces, like some on here are. Give your reader enough to get into, at least, that's what I say!
Hope this helps. Good luck with your story writing!
