The Merriam-Webster on-line dictionary doesn't even list 'routineness' as a word. It seems to me that it's a made-up word that means 'the quality of being routine', in other words, that which is characterized by repetitious procedures. 'usualness' is close in meaning.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.