I won't read something unless it's complete, and I prefer longer chunks if it's posted in chunks -- but I don't really care how long it takes for them all to be posted, because the story's not going on my radar until it's complete anyway *g*. And I don't care about day of the week.

I dislike it when headers don't say how many pieces the story's divided into; I fume when each piece doesn't have at minimum a link to the next at the bottom (and ideally a link to the next, a link to the previous, and a link to an index of all pieces); and I was pretty damn startled last week when a story whose header said "1/1" turned out to be multipart!