Typical BOM programs run for 12 months. However, can anybody say we are a "typical" bunch of folks around here? I think NOT. LOL
How quickly you develop a finished top is up to you. Consider the clever girl who made a whole quilt using just the Frolic block from April. Will you use just the BsOM? Will you do as I plan and add alternating blocks to frame the BsOM and expand the layout design? How big will you make each block? Do you want a wall hanging? A lap quilt? Bed size? Pillows? Table Runners and Place Mats?
I'm shooting for a nap sized sampler as a gift to a friend. I'm making each block using two or three different methods and color schemes. When one top feels "done" it'll be done and the next set of blocks will go into something else.
Because we are picking for each other and not swapping what we make, we don't have to worry about specific anything. Ain't it cool? :P