I've had to explicitly set up a recurring weekly meeting 4 weeks in advance to meet a higher-up at least once per week, because otherwise finding 30 minutes of their free time would take ~3 weeks.
I can't imagine my manager would find it very amusing if I had to tell them that I had to delay a bugfix or feature by 3 weeks because I did not schedule my meetings with enough foresight.
(I want to emphasize that I'm talking about this higher-up following a Manager's schedule, not a Maker's schedule [0]. At this point in my career, I was the [suffering] adapter between the two.)