I haven't found an "absolute" answer for you, but perhaps a way to think about your structure. The article at this link http://www.thedailycafe.com/articles/intro-to-math-daily-3 discusses how once the structure is introduced, you organize the time you have for math as you do for Daily 5.
I think the ideal would be to do all three everyday (in a perfect world), but feel that we have the choice as to what we ask of the students each day. I feel the structure asks us to have materials for all 3 areas available, and for the kids to make choices from each day. However, the kids may only get to two of them, depending on our specific schedules. We just have to make sure that kids visit all 3 areas throughout the week.
Make sense?
