Chapters should be however long you want them to be. Some authors have one or two page chapters (like in Holes or The Standby Game), others have "typical" chapter lengths (Twilight, City of Bones, Need, etc.), and some are insanely long or don't have any chapters at all (Lord of the Rings, Oakland Yesterday). The point is, a chapter is just another way novelists organize their writing. Your chapters don't even have to be consistent lengths, just end a section where it feels right, and if you end up with 700 words in 1 chapter and then 10,000 in the next, that's fine. You're the writer, you do whatever you want to.

If all the world is but a dream---fantastic posing greed---then we should feed our jewelry to the sea. For diamonds do appear to be just like broken glass to me.
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Roo loves yoo. <3