Limit time spent drawing e A few hours or at most one day of diagramming should do most of the work for a three week iteration e Occasional short sessions of modeling during the iteration can clarify any concepts that still need to be understoodLimit time spent drawing A few hours or at most one day of diagramming should do most of the work for a three week iteration. Occasional short sessions of modeling during the iteration can clarify any concepts that still need to be understood