I find it easier to just block off 4 hour chunks of my day as a way to convey: I'm only working during these times no meetings. In manager land a block of free

I find it easier to just block off 4 hour chunks of my day as a way to convey: I'm only working during these times no meetings. In manager land a block of free time is fair game, so play by those rules and make your own meeting with work. When any manager asks why you just tell them and explain. Seems to work fine.