I do my best to keep the rhythm of the week in mind, as best I can. As far as dividing stories up, it really depends on the story. Some I do write in 1000 word chunks, designed to be posted on tumblr in that fashion, but others come out more as one giant blob, and I usually have to go in and do some editing to divide it up into understandable chunks, or else I save those pieces to post as bonus stories on Patreon.