I would suggest debarking, and chopping out a rough bow right away and then placing the bow/stave in a frame while it dries to minimize the warping, twisting and other changes, particularly lateral movement. This can be as simple as a one or two inch reflex by placing a two inch block at the handle and then tying or clamping down the nock ends of the limbs ala Jim Riggs; but also, bracing with another piece of wood 90 degrees to the back end by clamping the bow from the side. This is important in my experience in order to get the string to cross at or close to the handle--the biggest problem making vine maple bows.
In Western Washington, I would suggest two weeks to dry. Then do the next stave and so on.
