1) Digressiveness 2) Discursiveness 
• (n.) The act of discoursing or reasoning; range, as from thought to thought.
Dis·cur'sion noun [ Late Latin discursio a running different ways. See Discourse .] The act of discoursing or reasoning; range, as from thought to thought. Coleridge. 
an instance of discursive writing, speech, etc.; a wandering or logically unconnected statement. · the quality or characteristic of ranging from topic to topic; discursiveness; digressiveness. · the process or procedure of rigorous formal analysis or demonstration, as distinguished from immediate or intuitive formulation.