The President has a scheduler(s) just like any important executive. That can be a mixed blessing. It saves the person from having to deal with requests for meetings. But it also means your life is controlled by that book. I’d imagine there’s not many free minutes in that schedule unless the President insists on free time. “Guys I will be in the gym 2-3pm deal with it.”
The President also has the extra burden of National crises. Which can trump any planned schedule.