Before making a time block, learn how to properly estimate your workload for the day in order for you to be able to successfully accomplish tasks.
Your tasks need to be doable within the span of time that you've assigned for it. To do so, you must prioritize what needs to be done during the day and what can wait for tomorrow.
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We all need uninterrupted work time every day, regardless of our role. Unbroken work makes us more motivated and focused. Yet uninterrupted calendar blocks are hard to design into a schedule.
We can't productively attend to meeting-heavy days while also spending hours on uninterrupted work time. We need to manage our expectations about what we can accomplish.
You, and only you, are responsible for scheduling personal time.