For my novel I try to get all my chapters over 3,000 words but lately they've all seemed to stretch beyond 4,000. Heres the question I'd like to ask, is it too much of a problem having my previous chapter at 5,750 words but the next only 3,300? It was initially going to be a single chapter, but I think anything over 6,000 words is just too long to read in one sitting. I have over 64,000 words and my novel isn't even half done yet.
However for my other two long stories the chapters only tend to be 1,500 - 2,500 words. I think it depends on what your writing about that determines the chapter length, if theres no sub-plots or other characters to follow, I find that the chapters average around 2,000 words.