I'm in a position where I spend half my time working on "manager's schedule". After a relatively short time of doing so, I adopted the trick of scheduling an all-day meeting for Wednesday, Thursday, and Friday. Then, when people want to schedule a meeting (regular or recurring), and it isn't incredibly urgent, they'll generally default to Monday or Tuesday, days where I primarily handle meetings, email, and short activities. This works well with automated tools that find the next available timeslot that everyone has marked as "free". Occasionally, someone will ask if I can accommodate something urgent on Wed-Fri, to which the answer is usually "yes", but despite that, I tend to have 7-8 hours of uninterrupted time on those days.